Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b861d564b76fb0…

MALICIOUS

PDF

38.5 KB Created: 2020-04-02 02:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 366e84938bfa325743d05bc5bc523627 SHA-1: f5b86625faa8168d070a9c2faf22b5ed175f8853 SHA-256: d7b861d564b76fb0f7f4995dc03e0d063f40f1012d2b30b22a86ac02f29783b1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a URL that aligns with the observed link farm pattern. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://iglootw.com/uploads/1/3/0/5/130551581/130551581.html#actividades+para+una+cancion+en+ingles
    • http://vakantiecotedazur.com/uploads/1/3/0/7/130775513/1865461.pdf
    • http://peacemakingcreations.com/uploads/1/3/1/3/131398269/7050355.pdf
    • http://tagmintz.com/uploads/1/3/1/0/131071159/c8677acdf8565.pdf
    • http://linoriart.com/uploads/1/3/0/7/130738854/1663041.pdf
    • http://dariobova.com/uploads/1/3/0/7/130740206/suwiziseb-babeputowip-xuwodezerikuke.pdf
    • http://blinds-nmore.com/uploads/1/3/1/1/131164210/1158911.pdf
    • http://mokka.haus/uploads/1/3/0/7/130739173/69712cd287.pdf
    • http://twigs-moss.com/uploads/1/3/0/5/130542936/vusezupabum-bipuzot.pdf
    • http://randolphassociatesllc.com/uploads/1/3/0/7/130740175/xunazibokutasul.pdf
    • http://kamcountryfarms.com/uploads/1/3/0/5/130539702/9a39ac39e.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c03.bin
e605763e9edca51960b59c133816a0502017e8350680db6628f6399939bde124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C03 8748 bytes

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