Malicious PDF — malware analysis report

Static analysis result for SHA-256 5149e1afa4fa642b…

MALICIOUS

PDF

69.8 KB Created: 2020-12-09 14:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c7bc52bdac883aa64977badb533a37c2 SHA-1: 76ef5b0e64b855dda9fa92d1087d6f3fce017ed7 SHA-256: 5149e1afa4fa642b90ee4a3a5b766ed03698fc7d88b143476f5c08ba05ed98ca
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

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/123?utm_term=rapport+de+test+logiciel PDF link annotation
    • https://konibexik.weebly.com/uploads/1/3/4/5/134515119/5451176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fa1b881dbb64.pdfIn PDF document text
    • https://denepuwukofakar.weebly.com/uploads/1/3/4/3/134316944/xurejudivolisatu.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tifuxasorelav-sunagutigu-gikisifexixabot.pdfIn PDF document text
    • https://kemipopebu.weebly.com/uploads/1/3/4/5/134585234/sazofadik.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/47a40.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/1f475570-873b-461f-a111-68c39d3beff1/sipatujikilupapajoxil.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/marriage_bio_data_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/angular_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/58075849641.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3b721972c46e3c6a7d4a/1606302578725/feledavubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117687b2-9156-4437-aa84-c15793888aee/my_learning_plan_nassau_boces_login.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_off0000d1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 5248 bytes
SHA-256: 16e04c045bbb2a6db875eb0ad00e5ba25d22263dbd0733d96c3a4fa2c89b3b96
font_01_sfnt_off0000e39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 12124 bytes
SHA-256: c7843123ffaef3e415f85a2ac3c5b9e32fe19b8321956a9352ff8af83ec2fce0

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