Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b835a5d9a4afd5b…

MALICIOUS

PDF

72.6 KB Created: 2021-02-24 09:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9ff06fa773f672ddd81c60a051038686 SHA-1: e525f6003404cfeabe91592688e22856809b07b9 SHA-256: 3b835a5d9a4afd5b1e82e0a13911112164687b46ace8e19a0b257d8321078447
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish for credentials. The presence of external URIs and the overall structure suggest this PDF acts as a dropper or redirector to malicious sites.

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 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://jacksth.ru/123?utm_term=how+to+reboot+verifone+vx520 PDF link annotation
    • http://femuvapazurom.iblogger.org/cpa_marketing_guide_bangla.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5ffa9e8377a13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_601bd426de3ca.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/hcGifnW/taylor_big_baby_review_2019.pdfIn PDF document text
    • http://masanakepatarar.iblogger.org/xutusoses.pdfIn PDF document text
    • http://bekowakiged.iblogger.org/7729012989.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/giviretebuso_lewuzewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415077/normal_5fdae7846929c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fd83385e57ce.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/0jiDhfM/73653380265.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/nexuvabiwag.pdfIn PDF document text
    • http://fafasun.iblogger.org/quickbooks_premier_link.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_60212cd9ac7b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobulowigewimu.epizy.com/arkansaw_bear_script.pdfIn PDF document text
    • http://muresapidun.epizy.com/electronic_access_control_thomas_norman.pdfIn PDF document text
    • http://minifuduredejo.rf.gd/67454934275.pdfIn PDF document text
    • http://tafoboverel.epizy.com/rulunise.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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 5060 bytes
SHA-256: 6b742e458979329ad368a9b5a69ac7cb0fb6b57000a52a311b7efc5449880c33
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 10956 bytes
SHA-256: 2e1ddb3ab3ff11cdf4bd07754d4a056b2ee82261c97f41101211eed29ade7c9f

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