Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e9c29fa3ef4237…

MALICIOUS

PDF

71.6 KB Created: 2021-02-27 00:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9a33bc78407af141e82e93736daccea0 SHA-1: e24b052115ef922a490f187b5c0834d5bb507bbd SHA-256: 12e9c29fa3ef42375c7d1f1dc040912cf31f8984ac8118a33efda38c8a21fcc2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://vilenefex.ru/wix?keyword=biochemistry+unit+review+answers PDF link annotation
    • http://digovin.getenjoyment.net/hellyeah_i_dont_care_anymore_letra_espaol.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/8929425.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/h2grgfa/tomuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5fdb59f4a0722.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/nge4ieX/snake_eyes_meaning_in_punjabi.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/gitjbfu/rugefof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_5fdc09f632ecf.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/ghJjdjb/earth_day_craft_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/ghiahiz/26481575642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fe17fcc17610.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/purezipademezagu.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/iakrjhg/83015496787.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/hb6PV5J/pexozisesuxixapefemifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_601387720a9c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_60081c190f6cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_6014fe0a848cd.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_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 5308 bytes
SHA-256: 411f99f7103e8a874fd3f24be455bd1173b7c5009bab9f484204b125cc26da02
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 10304 bytes
SHA-256: 64f37c529c90c99ef0f76277dde3272a64cc8ec678878610a246b6b57040534e

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