Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88b2c43fc4e0b2b…

MALICIOUS

PDF

74.0 KB Created: 2021-02-23 03:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e06b538ee0f52b9df29a866554a3568d SHA-1: f54b68a392cac233c89bfd5f56237c6b4c92fa61 SHA-256: b88b2c43fc4e0b2b6638874ae8a68b203582ac4a3dfabe90d378ab14fd233448
126 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ML classifiers and ClamAV, contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, suggests a lure related to research papers, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=differences+between+qualitative+and+quantitative+research+pdf PDF link annotation
    • https://cdn.sqhk.co/posojuvapono/bcFic2w/zion_national_park_hiking_trails_winter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409814/normal_60174fda60df0.pdfIn PDF document text
    • https://cdn.sqhk.co/davunosedepa/vq00gjk/solar_system_simulator_game.pdfIn PDF document text
    • http://crawlmqyu.space/chiari_2_malformation1a6pb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_600e5ecc38660.pdfIn PDF document text
    • http://gnoogle.site/wupopukegoc79hu.pdfIn PDF document text
    • http://richmaya.site/babli_badmaash_songjulkg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5feb246427dc1.pdfIn PDF document text
    • http://lovemecompletely.com/jexovoruwojupadopxt197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_601f8416c454f.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/hcmhfev/mubuno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5fffb09af21c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapigazezej.epizy.com/microsoft_sql_server_guide.pdfIn PDF document text
    • http://mibofive.epizy.com/83699132975.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/kavumenawurexotararedunab.pdfIn PDF document text
    • http://ximitexus.epizy.com/the_neverending_story_book.pdfIn PDF document text
    • http://bujisovi.epizy.com/website_redesign_proposal.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_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 5660 bytes
SHA-256: 981b8aad7878f7f07186b692145642d1cb2236b41302e801cc2ed1a864fb88fe
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 10892 bytes
SHA-256: 1e21e9e8f43ef611c5663370411619fb7170d83f3faccbad7ba0456c9eff2292

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