Malicious PDF — malware analysis report

Static analysis result for SHA-256 3663a3a491f7249f…

MALICIOUS

PDF

70.4 KB Created: 2020-12-21 07:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 826bbb689628ecf84b895ef0559b4f95 SHA-1: 83ae938af63ef6becd04663890b9ce8367c7f116 SHA-256: 3663a3a491f7249f3b4bdaea1bbe42eb8d3d8c8fa192a7b7b6e3f3e2f64dcf81
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary external URIs is https://trafffe.ru/strik?utm_term=callaloo+soup+with+crab+recipe, which is likely part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=callaloo+soup+with+crab+recipe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426690/normal_5fa2d841dcb7b.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/c22348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5fd5f95218c6d.pdfIn PDF document text
    • https://pitiwiju.weebly.com/uploads/1/3/4/6/134687602/6887556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5fa367ce63e38.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/a051a65c-38b7-4f83-a659-e61072a416fc/peduto.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/mario_flash_code.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/jagalikopokiluvoguraro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e66535-2d47-4401-810e-a788be5409c8/mm_trucking_company.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1057cc30a162e0c5324ce/t/5fcf84a30ff3944fc55d5151/1607435427724/hunter_legend_chaos_dungeons_idle_rpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114f2453-8635-43eb-9559-67f10cac7f70/michaelson_family_tree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ccd16db-cd05-43b1-b347-b7fbd0f8688a/73644147941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb97f2e-e820-4c32-a2c7-1ce9b695ba2c/wasuvemufel.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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 5160 bytes
SHA-256: 604a95300be52af821c04489d77b0b9078ea0a988f00593ce45396585d2f88c4
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 11700 bytes
SHA-256: efc6a09e0096b52a3e44d853c315d152295779b560ab02532e905bb67ce0c710

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