Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b90684d6e27e9f9…

MALICIOUS

PDF

88.4 KB Created: 2021-03-29 21:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bbe5958f142a324236b457d4d68a0d7a SHA-1: d6b9166114a30d3623df96caed86a6a533355f82 SHA-256: 8b90684d6e27e9f9e94abd12ef2b33aed2b6da4652b92b5a762bb253a6f82ec5
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It contains numerous external links, suggesting a link farm or redirection mechanism. The presence of the URL 'https://bologen.ru/award?keyword=durga+saptashati+pdf+telugu' indicates a potential phishing or SEO manipulation tactic to attract users searching for specific content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/award?keyword=durga+saptashati+pdf+telugu PDF link annotation
    • http://wixujikubipom.mygamesonline.org/52547299133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_6032fec62c30c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_5fdc22167395d.pdfIn PDF document text
    • http://cosmicgig.com/wumot5902j.pdfIn PDF document text
    • https://zimavilagapiwe.weebly.com/uploads/1/3/2/7/132712623/bileso.pdfIn PDF document text
    • http://greenbike.shop/best_voice_changer_free_softwaret4n1r.pdfIn PDF document text
    • http://maewallace.com/notasibabowuronuvowoji6722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_6016feec28c0c.pdfIn PDF document text
    • http://stingeksoj.online/wanodibil5bd0.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/8199303.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/tutinizibiponexusifek.pdfIn PDF document text
    • http://select-get.top/what_events_happened_during_the_great_depression6iuhl.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_a60dd5da7c1f4297bb7c36abec3e4cca.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_f3531cec736b4971a6f1fef15c5a38ac.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_c33a1945ea1847c094599377668c6e58.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_2b470fdddaba4f248bd244527d727c58.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_1e9d29fb990c4759ab03913eb17e26ac.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_e871aeca7d4a4670a0bda5234dbfd189.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_c7ff041f27974d77b89ccac91e6addac.pdf?index=trueIn PDF document text
    • http://wenares.myartsonline.com/55523155557.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_3621f05ec04544f2bebc876177536ba6.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_fc49fffbc85f47aaa9b5c7c50b187860.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013ca3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13CA3 5708 bytes
SHA-256: 2651fc4b4f5389eefbb58087cf5294d051a921efebc175dc4282e21ad75d0127
font_00_sfnt_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 5300 bytes
SHA-256: 9d49449f1be069e384e0a4beafac347d77947e8c721e0136f30c58624ac48e47
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 6360 bytes
SHA-256: 5207a65a3435751039b2aac1da66c4d80bf5c20577ec7799c49b6fedc166208c
font_02_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 11568 bytes
SHA-256: d06cb3e30384098f6a8a28118680151d9eb1273ba1108d2c8123cc5e057db630
font_03_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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