Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f37521ab8134a81…

MALICIOUS

PDF

73.3 KB Created: 2021-03-02 14:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 91645425118d462a91c138af76c0dab2 SHA-1: 5086a853f788a96d0bce5d45f62ded20b55332d5 SHA-256: 5f37521ab8134a813c6f0b2c0cb2c3ed1a983ace0b428a6f89d1f0f5645d0d39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/123?utm_term=microsoft+word+exercises+for+beginners PDF link annotation
    • http://nicepics.xyz/minecraft_brewing_chartbcb1x.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/sizosu.pdfIn PDF document text
    • http://afracheat4.xyz/best_jeep_service_center_near_me8kg27.pdfIn PDF document text
    • http://top-salez.site/87277915635ter6o.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/56082175764.pdfIn PDF document text
    • https://cdn.sqhk.co/vikafaselida/gjsAWY2/clash_of_clans_miner_attack_strategy_th11.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/hhjZ9La/master_math_word_problems.pdfIn PDF document text
    • http://kidepokapila.22web.org/jaguvorijekuroxurinu.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/qdZgdje/the_tribez_castlez_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogemidagubaro.epizy.com/2018_buick_regal_gs_performance_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/30770552075.pdfIn PDF document text
    • http://numebazo.rf.gd/addition_worksheets_year_2_tes.pdfIn PDF document text
    • http://webekilijonelew.epizy.com/badarabepiboxibozu.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/refisisozokosefobu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 5252 bytes
SHA-256: be4222e43a6a3d78716dc94a73dcfa461ee960deeb9876d9de276dc78d61c33c
font_01_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 10012 bytes
SHA-256: 1eb74f7100c2e3b506a9eb6a5724f90a63f2db6e929aa92e1580ae7372f3f19c

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