Malicious PDF — malware analysis report

Static analysis result for SHA-256 3670cbb4c163e697…

MALICIOUS

PDF

65.8 KB Created: 2020-11-28 14:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba3824c9bcdff4c3858aba7e952da6b6 SHA-1: 9105f55ac45b4f42dc30135711cce8c3aa20d86f SHA-256: 3670cbb4c163e697f502b83a28f6953cad3b9438dad9e9565af6877110beb99d
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 0.9998

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=12v+air+pump+for+inflatables PDF link annotation
    • https://gowewibejeji.weebly.com/uploads/1/3/4/4/134481286/2152061.pdfIn PDF document text
    • https://zemejinifuv.weebly.com/uploads/1/3/4/5/134577925/xidul.pdfIn PDF document text
    • https://dudepemak.weebly.com/uploads/1/3/4/7/134702006/97ef423b28e.pdfIn PDF document text
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/461c1049.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/gukav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_5fbea5fbe8637.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/6448319.pdfIn PDF document text
    • https://woxevodojagub.weebly.com/uploads/1/3/4/6/134623787/51ce1537763c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70cb0713-35e4-4063-8e70-7b7287b60585/favutilizula.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/13181334538.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/zawujiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6be5e95-e0af-4afa-a550-74d9955d1a46/potaxiwubepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af83f12-2577-49fc-a073-9bc8f1bf628b/33424070664.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/authentic_assessment_definition.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_off0000c5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 5336 bytes
SHA-256: 4f152cf5d60e424a75fe0f4c6b17321d009aba59083f57a0fb924ff072086171
font_01_sfnt_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 10132 bytes
SHA-256: 32013e24f827a2b93dbb1844ce4b73fee52a31eca63c69984bb1d549adb916e1