Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb860d3c61c2f2e0…

MALICIOUS

PDF

82.0 KB Created: 2021-02-02 22:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cbb91a5c9f5afd851a667886492e2d5e SHA-1: be885fd977b8d50564544008c19e64bcc3e9c96e SHA-256: cb860d3c61c2f2e06eadc0567ab90ab0212bf790d26b0df7ea4ba4245e7fdb62
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of compromise.

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
  • 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://leonvi.ru/123?utm_term=rompehielos+cristianos+virtuales PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470405/normal_5ffc0991c5609.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384649/normal_5fc5eb9c63056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_601457937b390.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/zaxexib.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/temafuno-xageveba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_5fcd45eeba16d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5ffbe4bd64c42.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/tobubitaviwera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_600d9acc35bcf.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/fuvimumawaro_kozogalonu.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/b69386c53.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/fezenur/contingency_plan_template_australia.pdfIn PDF document text
    • http://lenidifumejuvig.rf.gd/74036107134.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/dakoxamipusiwix.pdfIn PDF document text
    • http://punugituk.epizy.com/60360080864.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/life_history_of_great_scientists.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_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 5240 bytes
SHA-256: e6f2f295739fd71d1b89d30e37305eebab8be454c347731b41fa5875ba65fd27
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 12196 bytes
SHA-256: e4cf18ea274c595e84d7dec3f88d3dd46edcf040665582fd63c2eb1ff2e35e17

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