Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf699892bcec9c4e…

MALICIOUS

PDF

68.3 KB Created: 2021-02-24 16:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae7ed2836357e7edffa41cc39b469914 SHA-1: 83e2dc87b8e3364af9a2246f5b90d25ebc889acd SHA-256: bf699892bcec9c4e76ad24bd5fa4ccc7c22012c7e6d64321cdd3f86fcf1cd206
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://bologen.ru/123?utm_term=snap+on+torque+wrench+3%252F8+drive PDF link annotation
    • http://leomannapov.com/pekaziwekileruwopdc0.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/M6gdQFW/freeze_dryer_for_food.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/hdVZjex/top_ninja_foodi_recipes_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/ks7ijji/quick_dessert_recipes_with_biscuits.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/5191961260.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/ghjaFif/54023107996.pdfIn PDF document text
    • https://cdn.sqhk.co/kamugututu/gHBgcjf/luzumakenesiwagasa.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/descargar_musica_anthony_santo_en_vivo.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/jajig.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/65822813438.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/vufupu/dowetotu.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/do_all_oral_b_brush_heads_fit.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/skysports_tv_guide_nz.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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 5728 bytes
SHA-256: 4033dcecfc013ffe9f4e1c0b110b242cff3d80893022ab79192742ba6b78ee50
font_01_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10748 bytes
SHA-256: 19ab790393a50e73852c5b934a49920231d9e4cc2ad4492c47a4c231175e4d85

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