Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d46f65d023d01c…

MALICIOUS

PDF

73.6 KB Created: 2021-04-04 20:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9e4aaec75a2ac5720482d38d52c034ad SHA-1: eb4ef8db9f486e190318a74408316ec21ee8ca50 SHA-256: 20d46f65d023d01c5814b126255051da6ab7afe14b83e8aa170a25d3b8c0da2e
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm designed to obscure the true destination. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+find+hidden+photo+folder+on+iphone In PDF document text
    • http://ruszaimclub.ru/automatic_call_recorder_karna_haikenq1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_6015d029e60fa.pdfIn PDF document text
    • http://huseyincanx.com/law_of_attraction_planner_freedom_masuawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503578/normal_6018882db17db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_60251df328769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_6050320bd5420.pdfIn PDF document text
    • http://pinegrvuig.fun/xizemolupovodopijotiduogltt.pdfIn PDF document text
    • http://montana-media.com/92697358332h1yck.pdfIn PDF document text
    • http://cardio-active.site/dell_optiplex_gx620_service_manualonxm1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_60617e8818a21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_60241fe37fddb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fulazelof/bazipolomakivanelonuni.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_865f6b15e7f14f1f9ad727b1e7efea61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/neurological_assessment_scales.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_2acd9f06156243e7981a9608fb2f108c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xipavir/dutra_sheet_metal_co.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_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 4792 bytes
SHA-256: 55be84872c99119fa61d8cb46dac27bca57f33d3a8651449d940775b5ddd449b
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 10816 bytes
SHA-256: 397af73760581e323ac87aa3e11991b62a3799fba81120162afe870bfd5a01cf

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