Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cef62911ad047b8…

MALICIOUS

PDF

68.5 KB Created: 2021-02-13 02:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c55cc1e9099008c891ae507ceb3032e7 SHA-1: 4cc5ca8be30152dee21ff6d24af433db684cc851 SHA-256: 5cef62911ad047b8153e1e1fc45f6a85a505bba62ec1ccc70df96e0bc9fce126
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and ClamAV detected it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=pressure+cooker+sealing+ring+sizes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5fe687f1de8b7.pdfIn PDF document text
    • http://potobol.22web.org/equilibrio_de_nash_ejemplos.pdfIn PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/a4d53100.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/8329626.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/tifazudufod_tegopotesaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_6008020b46bec.pdfIn PDF document text
    • http://clyb-wylcan3.space/beat_street_customeajtr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_60270d5f5418a.pdfIn PDF document text
    • https://soresewo.weebly.com/uploads/1/3/1/0/131069968/pesoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_6019f0b1661db.pdfIn PDF document text
    • https://mepapezivodeno.weebly.com/uploads/1/3/0/9/130969154/kakisezevagixewo.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/427025.pdfIn PDF document text
    • https://zodixezujiz.weebly.com/uploads/1/3/5/3/135345824/jifaleselugajuv_teremuk_mumejeren_losarazijivafaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_60246b8d3d366.pdfIn PDF document text
    • http://bio-ita.fun/97727688499ph7h4.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/7850644.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 5084 bytes
SHA-256: 44b507e2e527113f71bfa3ed644b277d61fbe9cf262636f2900e22bf6fade716
font_01_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 10524 bytes
SHA-256: b99fd13936df081a3656ac8c199195f5faeed9a950f74f46246eca0f0fb861f5

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