Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca1c2c6944624e1…

MALICIOUS

PDF

62.6 KB Created: 2020-11-14 11:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a330e30b32aa680f44625bf7181bd961 SHA-1: 11b173159aca050c156377b2e8769319c5816294 SHA-256: 7ca1c2c6944624e1dd42de43bbed299b73be7f39e85fefc4c1f99d09ef3b6355
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, including one to 'traffking.ru', suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the PDF structure and external links point towards a malicious download or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=amar+ujala+news+paper+lucknow+pdf
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fa50f2314db9.pdf
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/5e87f7dd.pdf
    • https://cdn-cms.f-static.net/uploads/4421036/normal_5fa34f9a3925a.pdf
    • https://wusumojasojufe.weebly.com/uploads/1/3/4/3/134352244/6168762.pdf
    • https://derifopo.weebly.com/uploads/1/3/4/4/134490925/muxeruxadomigofaz.pdf
    • https://cdn-cms.f-static.net/uploads/4409250/normal_5f98ec2cad825.pdf
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5f9597579d4e0.pdf
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/pijunofegi_nemebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nefagolom/piedmont_blues_tabs.pdf
    • https://s3.amazonaws.com/nilafafakem/38762362244.pdf
    • https://s3.amazonaws.com/sowewazulejewi/dosis_amoksisilin.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a56f.bin
7256a1afd82a127e44e8b19c6055f6b82cc9aa761b8071618a75f4c8752c8d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA56F 5524 bytes
font_01_sfnt_off0000b833.bin
d8d3241e9193bfcd27cf00f1c92e7d0a88b440edfc8c42c930d3aee06cd6a238		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB833 9612 bytes
font_02_sfnt_off0000d876.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16164 bytes

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