Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca008537088cd8e…

MALICIOUS

PDF

81.5 KB Created: 2021-02-24 20:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 79b87b72f2f9e04c2768cbed505e0d3f SHA-1: 63b696cd197892d87eba75e920b0c6a6b47956d3 SHA-256: aca008537088cd8eb52cbde8867b0373209395a87b6d17cf5579cff6ab20eba4
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 0.9997

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://druttle.ru/wix?keyword=maplestory+dragon+knight+guide PDF link annotation
    • https://cdn.sqhk.co/fuxuduxexi/aZggmgc/brick_blast_master_build.pdfIn PDF document text
    • http://podeves.xyz/tilolewugenunfta3k.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/ehnhjgj/risusexetikopagu.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/Vnji0GA/22883948788.pdfIn PDF document text
    • http://idealica-italiaofficial.site/definicion_de_arritmia_cardiaca975zp.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gfw5gJD/90363570236.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/rajewuwomukake.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/public_relations_job_description.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/81056172821.pdfIn PDF document text
    • http://logururud.epizy.com/piano_music_sheets_with_notes_for_beginners.pdfIn PDF document text
    • http://dubabin.rf.gd/18931290788.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/wanal.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/holden_evening_prayer.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_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 5392 bytes
SHA-256: 37a28618f3e3e8680dab0783d2894468e3d7279490e2b4c0bbd2f7da22f685cd
font_01_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 10544 bytes
SHA-256: a27fc03a12b24c6cf59e556d29372fac723813909ff5e0c43bf625524c01eb61

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