Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4bb45ebf491e0c…

MALICIOUS

PDF

79.7 KB Created: 2021-03-20 00:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 97cac0520f9d826ef3e75bf5f5f662e8 SHA-1: 6cecdc1234f7ec19fac99979abee0e74796c07aa SHA-256: 0a4bb45ebf491e0c81a4bdcf533ac5ea3c308a34aa512de3d2a416a09b0dd8c5
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many of which point to disposable domains, suggesting a link farm or redirection scheme. The document body, though truncated and obfuscated, appears to be a lure related to search terms, directing users to potentially malicious URLs like 'https://botokaw.ru/strik'. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' and 'SE_PAYMENT_REDIRECT_LURE' further supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://botokaw.ru/strik?utm_term=machine+learning+with+python+book+github PDF link annotation
    • http://digitalcalakk1.xyz/letapegesimijafadokapusuvw4hm8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6019c6e608a42.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/jdjcWHi/92860010057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_603d388a177a1.pdfIn PDF document text
    • http://merovew.xyz/wilson_bureaucracyip8gb.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/jgqsZEW/fejixugovatujatawi.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/fi0hgia/lalemogusenujadimovopiva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5fca6b4e44cfc.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/lavipugug9fy7y.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/fzZuijf/swordman_reforged_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fcea674136f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minabiwa/auralux_constellations_apk_full.pdfIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_513c807f40d747b3b9e953c78867af79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/tobufokewikebeju.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_a1c73dd3c70d4052a9f5e982082837ff.pdf?index=trueIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_71de6535add54becb9f959352a2c7ef1.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_6cf53f0d2dff41c3963eb743f2d39378.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/75515848937.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_d771f6ee88f7410e9b4026ce57d8b32c.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_79dc82b253354d2eb2c66e02a426f23c.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_6b5b8b19006946c3aa489e76fb2d5468.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 5420 bytes
SHA-256: 328de3a1980356342db860373ed0e57550ef32d6748ab09cdd97a19dbb8a3142
font_01_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 10964 bytes
SHA-256: 3ac3be94cbe78abc618081e342481849481ffce5236c61d858a0c51218a1ca47

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