Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7a8b3796b7e6fa…

MALICIOUS

PDF

80.5 KB Created: 2021-02-19 06:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2760119d18e22be49bbfa0e70c725c8f SHA-1: 00816b47d6e5cb942d60e0128fe1967132f7ee1c SHA-256: ca7a8b3796b7e6faf88fc152307f1ff49ffbf2ff0b415afb3a3e0fedbd98b995
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute content or redirect users. The presence of a "download button" heuristic and the ClamAV detection as "Pdf.Phishing.Trojan" indicate a malicious intent, likely to trick users into downloading malware. The document body, though heavily obfuscated, contains keywords related to downloading free PDF resources, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=basic+c%252B%252B+interview+questions+and+answers+for+freshers+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5ffb7e7a03b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_60214d3f6e301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_601c90ceecad1.pdfIn PDF document text
    • https://toxuweraf.weebly.com/uploads/1/3/4/1/134108638/sibagofebafigoxabir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480886/normal_6007488008a42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_6015890b6f34a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662c978138.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/sivevivu.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/60bb6b62f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5fd330edb7f17.pdfIn PDF document text
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/bekuwaji.pdfIn PDF document text
    • http://fazojum.66ghz.com/fupuwolopobopibi.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/xexipijaraputakebasa.pdfIn PDF document text
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/186139.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supewomok.epizy.com/les_miserables_musical_cast_history.pdfIn PDF document text
    • http://loxeputogojew.rf.gd/sexirimijubuzevapaxoz.pdfIn PDF document text
    • http://xuboxigaxa.rf.gd/fallout_4_contraptions_workshop_guide_fr.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_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 5572 bytes
SHA-256: b59fad2070b3747b00f52258776d98b603f335fbc32fd49f2e527b4f737a9073
font_01_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 11348 bytes
SHA-256: d244fe3deb362b0a5db1ee396ca7db67ab00480af530ea9bb08b511644c33842

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