Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc05dc1c151cf068…

MALICIOUS

PDF

67.8 KB Created: 2021-04-06 11:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 645f24b914e66b780c2ad0180038a318 SHA-1: 8381f899aeeeaa4b3f1ee1379659c840a2cbdf51 SHA-256: fc05dc1c151cf06882b281d6acd428914ce7ec6af947fef374df454c870688ff
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/123?utm_term=photo+background+green+free PDF link annotation
    • http://sogigubesidon.22web.org/69491710186.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/do_charcoal_drawings_sell.pdfIn PDF document text
    • http://kimugifogetami.medianewsonline.com/bafojadoletolekowe.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/learn_to_play_bass_guitar_for_beginners_free.pdfIn PDF document text
    • http://vojamugoju.22web.org/cpanel_tutorial_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_50bf161377ae4c838acfbf941e62539e.pdf?index=trueIn PDF document text
    • http://nawatelobuj.rf.gd/good_morning_shayari_photos_free.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/articles_of_confederation_weaknesses.pdfIn PDF document text
    • http://moniladipawi.epizy.com/57626391315.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_1d1bff73d9314d8595021398dc86e5b1.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_2b3e177b28354ddab1d0b7bd0417246a.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_d72c79cb04a34cadbec006e6be6899b7.pdf?index=trueIn PDF document text
    • http://vamanufa.rf.gd/oxford_bookworms_library_stage_6_jane_eyre.pdfIn PDF document text
    • http://todiwefexoneb.atwebpages.com/air_brake_system_components.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_97c8dcc8c96c4f5eb0f2e2e0cb6d7aa9.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_ac8bc23d5f0344658a5f0d05dba091ac.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_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 5276 bytes
SHA-256: 10794976b22a50789fd8f56340896676a305235825912b82f80b4536f2ee75cd
font_01_sfnt_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 10032 bytes
SHA-256: 6a7f961d44cf638c6532c74dd989a608be9bc9853f669c2bdaa3fc5b14033853

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