Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ffaca548883d0f…

MALICIOUS

PDF

67.0 KB Created: 2020-11-09 18:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a28d53d8a205875dc62d87f0e1316f6e SHA-1: d59a22ef2fbe20578965e13931635925e0d2ae11 SHA-256: 79ffaca548883d0fbd318aadedc5c19166358249a5451d7b68b102765519a4e8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to lure users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?keyword=aha+acls+provider+manual+ebook PDF link annotation
    • https://vidigesiwixir.weebly.com/uploads/1/3/3/9/133997627/subitiwaguba.pdfIn PDF document text
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/vonaredogaperim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_5fa8b87ecdd59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f884ec025017.pdfIn PDF document text
    • https://logukevagas.weebly.com/uploads/1/3/4/5/134507161/eea041ec67da968.pdfIn PDF document text
    • https://nezemugobif.weebly.com/uploads/1/3/4/5/134519414/pusudomedoz-tavamanabamare.pdfIn PDF document text
    • https://bakurisevujukuj.weebly.com/uploads/1/3/4/3/134368754/050df.pdfIn PDF document text
    • https://fulutikirulile.weebly.com/uploads/1/3/4/4/134471812/8429855.pdfIn PDF document text
    • https://xadaxegaku.weebly.com/uploads/1/3/4/4/134444747/kejugusepimuluja.pdfIn PDF document text
    • https://vumusubivabup.weebly.com/uploads/1/3/4/4/134491869/3ae7a4d1c8d1.pdfIn PDF document text
    • https://xitawameduzip.weebly.com/uploads/1/3/4/5/134511141/ebc9e53e3ac.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/henghuili-files2/state_volleyball_tournament_2019_iowa.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_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 5568 bytes
SHA-256: b20d04b0455e133432cadb5796a737d74913d0f5ea9ef82cd3bf98c0564759fb
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 10304 bytes
SHA-256: 91542240d4589fabde6dd7fb8cb224d03ee232aebe498fac42d43dd0ede60505

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