Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd4628e051d6957…

MALICIOUS

PDF

75.3 KB Created: 2020-12-19 12:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f360b8692adc5b5441ebfc85e494a1b5 SHA-1: 42fe3ca2a086b849737795cf742120f3ac337347 SHA-256: 6fd4628e051d6957a191a4643433dec50e9721d94b6702808caa6fcd961db878
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one URL identified as a known malicious redirector. This suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=linda+woodrow+470 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_5fb4e34f0f484.pdfIn PDF document text
    • https://karubidodofibe.weebly.com/uploads/1/3/4/3/134316277/a11a75c1c8.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/3901876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_5fb7df1c28059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_5fac13bb568c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0dda31452f90b7fe53205/t/5fc5a4d91972c46e3c61521d/1606788313638/do_u_need_crutches_for_sprained_ankle.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/mebunavenidexawofepevev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2869cef8-596d-4d12-9a46-8c17046c1227/disney_descendants_2_soundtrack_down.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4dcaf8cdb769c6d9284a/1606372811847/89691666156.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf4ca173fb5383b677015/1606284491852/gedafajivomew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdec3641ec4a2cc0dfacdf/t/5fd1a4447c12252903f0fea4/1607574597035/cake_decorations_diy.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3d0288139af0376575e17/t/5fc41055e18c5c478e7a5c9c/1606684757739/deutsche_bank_national_trust_company_headquarters_address.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_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 4952 bytes
SHA-256: 43e82346c0a89b324cdc6d2fef6129800dd88c16d5b2ca426c1ab712421ad153
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 10436 bytes
SHA-256: 8738c0c026e4665f2f7b1afed81327c82ce4ad9f5fdc5347fb88e6ea070e010a

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