Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bd1dce088110cd…

MALICIOUS

PDF

70.5 KB Created: 2020-12-17 00:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91cafc96df8fa4a9bbc7f27f04090542 SHA-1: 2bcc9267658d066871cfaf24184c7ee246304920 SHA-256: b9bd1dce088110cdeeb65c0fe8565b3b9f3f13ebdf9c5a6389772074992aa1e4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, including one to 'traffine.ru', suggesting it is part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=remove+nth+node+from+end+of+list+javascript
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5fa7a265b2444.pdf
    • https://lopuzidijunusi.weebly.com/uploads/1/3/4/3/134378181/5030813.pdf
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fbc3592c4754.pdf
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5fc9c09bc0ab7.pdf
    • https://cdn-cms.f-static.net/uploads/4405467/normal_5fb5c11dae3e3.pdf
    • https://cdn-cms.f-static.net/uploads/4468255/normal_5fac4c3c07704.pdf
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fd0d9afb390d.pdf
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5fd33a2e5fba8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc7aadcfa9ecc3978a0d924/t/5fce2223fe657040d5bab48b/1607344675757/larazepipapuduvoviwoxe.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2899eaf37e3b6465355d/1606297754203/dirty_deeds_lyrics_and_chords.pdf
    • https://s3.amazonaws.com/bizamesuwepe/17397249575.pdf
    • https://static1.squarespace.com/static/5fcf08e1f07fd00950ddd8b3/t/5fd6d05a7fc52c2069356b55/1607913562569/public_policy_making_and_analysis.pdf
    • https://s3.amazonaws.com/tevomenil/cheatsheet_app_watch.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_off0000c8e8.bin
b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 2900 bytes
font_01_sfnt_off0000d32b.bin
ec675a8048dccf1b3c70d239b3a066e77cec4c67dec7f0a5df4bc1cf376e5131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 5540 bytes
font_02_sfnt_off0000e5e6.bin
4e3dafa5236f0421bddccfdf5740d85bfd2b485edf6b709d7033839800ef0db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 10840 bytes

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