Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ee2e2b7860ecd7…

MALICIOUS

PDF

77.7 KB Created: 2021-02-14 15:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f3814e6a97fb68851241084afd12cf70 SHA-1: a2de8afd7c040a0770ed16ace0b65a8aacb23d6e SHA-256: a9ee2e2b7860ecd737d898db5b14c7e27480917587644bdc06270ab5b2806488
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various domains, many of which are hosted on disposable or suspicious platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wb?keyword=almost%20friends%202016%20movie PDF link annotation
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/xaletir.pdfIn PDF document text
    • http://supernefritroller.xyz/baby_boy_beautiful_photosikodk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_600730cbd1504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_601d125ec563b.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/green_leaves_of_summer_piano_sheet_musicw4xqb.pdfIn PDF document text
    • https://nedijevir.weebly.com/uploads/1/3/1/4/131406348/2416161.pdfIn PDF document text
    • https://livurexile.weebly.com/uploads/1/3/2/6/132695833/xumag.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/2775441.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/5508925.pdfIn PDF document text
    • http://apsmall.space/knight_leveling_guide_talonro4hesc.pdfIn PDF document text
    • http://jejarit.iblogger.org/zoreguxegagovuxan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465694/normal_5ff3a4d76fe0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419827/normal_5ff7dc5f5796b.pdfIn PDF document text
    • http://options.expert/download_ultimate_car_driving_simulator_pczbl3p.pdfIn PDF document text
    • http://m-laskin.ru/43124523299gp0s6.pdfIn PDF document text
    • http://puwisagoki.22web.org/bridge_to_ielts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junorijuzijipu.rf.gd/57346341807.pdfIn PDF document text
    • http://segukilu.epizy.com/60872076323.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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5372 bytes
SHA-256: 05e3ea2112d085c266d98e43f0f438314cbf311ff215883a9defa3498403b1b8
font_01_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 11188 bytes
SHA-256: 04925818c1277c2cd16fd98f398d2a98f60eae69eb74941336e63610f610b868

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