Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ff9330034df3a1…

MALICIOUS

PDF

59.8 KB Created: 2020-11-26 05:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f8e4f7f33823c1f40d5a60017aa30527 SHA-1: 1500f5b8da0951fd22d7b4b0b1847843d34e3db0 SHA-256: d9ff9330034df3a1a4ea2f8c92417d865f3443cf029f184b21aea9e52a3cca94
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=tu+46+hacked+unblocked+at+school PDF link annotation
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/ef8f54f3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_5fb5d5e63973c.pdfIn PDF document text
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/42912de0286a713.pdfIn PDF document text
    • https://wuzajamepoxomis.weebly.com/uploads/1/3/4/0/134096323/pefamikexerexil.pdfIn PDF document text
    • https://lozojoni.weebly.com/uploads/1/3/4/3/134358657/zoponipovalekori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f9b1ad136889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_5f9aa0535a0cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_5fb93bd1cf4f2.pdfIn PDF document text
    • https://nudonadutosaj.weebly.com/uploads/1/3/4/5/134595964/3046653.pdfIn PDF document text
    • https://damoleruli.weebly.com/uploads/1/3/0/7/130776580/4c90b376a4.pdfIn PDF document text
    • https://futiwetag.weebly.com/uploads/1/3/4/3/134367494/novase-xuvudujutotinim.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/jupevuxirapi/32357688879.pdfIn 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_off0000ae7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 5328 bytes
SHA-256: 8791221b6aeabc5d71bc5998a2f02f6278a27fabdc5978bbb3b5abeb97380269
font_01_sfnt_off0000c096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC096 10012 bytes
SHA-256: 301aaab9447642d718043db5ae98ddb480ddc572e99d47a50607ffc55873da00