Malicious PDF — malware analysis report

Static analysis result for SHA-256 3354f1db38a0eb56…

MALICIOUS

PDF

74.9 KB Created: 2021-02-12 15:37:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b24d0f53f9a397822214a11bde8828d8 SHA-1: b0d52ad5ae17402cda6a4f79944240d0cb401c1a SHA-256: 3354f1db38a0eb56295ffee1461b7446f125f31a51ba3475e7d3e56177609139
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or a method to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to an 'installation manual'. No scripts were extracted, but the presence of numerous external URLs indicates a strong likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=ruud+air+handler+installation+manual
    • https://static.s123-cdn-static.com/uploads/4444370/normal_6003a785e5dc4.pdf
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fde7203db959.pdf
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/fuvavowali.pdf
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/09926fa06ab4a.pdf
    • https://kerixagagunusuz.weebly.com/uploads/1/3/0/7/130776265/b1dad4279b4.pdf
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fd9761e26b0e.pdf
    • https://static.s123-cdn-static.com/uploads/4407060/normal_5fdd28b4b1099.pdf
    • https://dowanudamedi.weebly.com/uploads/1/3/1/3/131398164/e4e807ef344c54.pdf
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ffeb74bb53eb.pdf
    • https://static.s123-cdn-static.com/uploads/4483587/normal_5fe34582447c8.pdf
    • https://rebenanutizoder.weebly.com/uploads/1/3/4/7/134752372/jiminevukanimos.pdf
    • https://cdn-cms.f-static.net/uploads/4486772/normal_6018632901190.pdf
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/2955398.pdf
    • https://static.s123-cdn-static.com/uploads/4385880/normal_5ff201456e398.pdf
    • https://cdn-cms.f-static.net/uploads/4366995/normal_601983cd6549c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sukedil/drug_using_parents_policy_guidelines.pdf
    • https://s3.amazonaws.com/kotenu/candlelight_punjabi_song_djpunjab.pdf
    • https://s3.amazonaws.com/wezukep/12316326020.pdf
    • https://s3.amazonaws.com/dosipive/brain_out_level_70_answer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb4.bin
1fb764bd2022a345b095f981e83f6402253ee9ededd7b00059194fe2d8e47c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 4956 bytes
font_01_sfnt_off0000ee55.bin
b479ea5da97f3ab63969a492eb9255c5a77b7d40e6f629a6e031864d95042434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 9848 bytes
font_02_sfnt_off00011008.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 4324 bytes

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