Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd2ede9d7ab522e…

MALICIOUS

PDF

76.6 KB Created: 2021-02-28 11:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 883c9bcb400538f5b74b0d14804cf563 SHA-1: d66f3c5a16970b66d0fd52c7cc3b8b9ea022cc4c SHA-256: 8fd2ede9d7ab522e02f6b76df78c71384e6398a6bfa8331892f2dea80c934dc7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host many links on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the presence of external URLs points to a likely download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=old+school+hip+hop+groups PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501046/normal_602c8f04595c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_603586a83e141.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/78667671872.pdfIn PDF document text
    • http://sweetygirl.club/5845182169rg22b.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/oracion_al_espiritu_santo_iglesia_catolica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_6013cd6339a80.pdfIn PDF document text
    • http://openplafond.xyz/vw_polo_transmission_fluid_checkg2cc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fca8ddd00dd2.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/how_to_calculate_score_on_sat_subject_test.pdfIn PDF document text
    • http://giveaway2020.info/99862463700swdkm.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/ap3gEl9/32061368478.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/30_day_muscle_building_workout_plan_without_equipment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/3683410849.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 5152 bytes
SHA-256: fb79dc85a8e6ceebe5ac5ab5fd092c68f072ab6b42ed07813e58f80ec6b78207
font_02_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 10800 bytes
SHA-256: 8392eccfdcaf7407787ec69ef8bc8a614a914445c7ecacd007183b24fa5a5151

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