Malicious PDF — malware analysis report

Static analysis result for SHA-256 23619ffd7fd9a524…

MALICIOUS

PDF

77.0 KB Created: 2020-11-10 07:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3b615ce5edd9d21ade9013ad83af240c SHA-1: d327293100eeda959f6a003bff029956f9d0d4eb SHA-256: 23619ffd7fd9a524eb201ec86c83b8b4d9af42f3b8a660bf7d42b8309515223c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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://trafffi.ru/strik?keyword=machen+new+testament+greek+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f8b664c5c2a8.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/4877804.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/mipiranaku-kexafalavem-lelaxogo-zegodoleroxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bifamomove/dread_extensions_human.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/act_pre_algebra_practice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4161aa3-43a6-49e2-ac91-776c1c3063e5/sanuri.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/applications_of_modern_biotechnology.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/xegumawalififozelu.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/variedad_de_cafe_costa_rica_95.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/good_verbal_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/misivetuxisomajebemenawa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 5076 bytes
SHA-256: e48a8cb7cd630f31708ddd2e1e8d21fe352ab9979386d0f55f0190d0f1a0e359
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10648 bytes
SHA-256: ab66e84be1bee9d96c62b7ea6d6bd8d7bb1175d01af0bc80155d461140074e68
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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