Malicious PDF — malware analysis report

Static analysis result for SHA-256 8846a13087e5016b…

MALICIOUS

PDF

78.7 KB Created: 2021-03-26 14:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36bc549c9fefd108b4da69babaddc479 SHA-1: ff29b77242c712c5388d82c01487c45935aebe1b SHA-256: 8846a13087e5016b358c1b45b4dc17ac22b7dce949347b7d013835f17e4fc14e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, resalured.ru, which is likely used for phishing or to host a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to obscure malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/123?utm_term=accelerated+reader+quiz+answers+quizlet
    • https://cdn.sqhk.co/xozifejor/jfigjj6/field_hockey_training_equipment_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4388617/normal_60445c8172dda.pdf
    • https://cdn.sqhk.co/kobadaxo/QhjnJia/google_analytics_academy_assessment_2_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4383327/normal_60431e3adb60e.pdf
    • https://cdn-cms.f-static.net/uploads/4427811/normal_5fdc88b635d32.pdf
    • http://magnetfix.store/7408657024404n87.pdf
    • https://cdn.sqhk.co/xokebuzizo/YcigAIL/motorola_phones_old.pdf
    • http://lnstagram-helps-contact.com/ethnography_research_designz37bn.pdf
    • http://avtoshkola-region26.ru/how_to_blend_single_stage_urethane_paint7ks79.pdf
    • https://cdn.sqhk.co/samivegin/heihjdJ/43080085458.pdf
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fe4853fe6b8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_3a6366165b1e4484bf04cfa740cd1554.pdf?index=true
    • https://s3.amazonaws.com/kefefetafij/nasifigavegaxozeju.pdf
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_cb7f5fcfc1974ac889c437846d3be030.pdf?index=true
    • https://s3.amazonaws.com/wixanarer/17442455732.pdf
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_a5d5ea09487d4fd7a4b1b1ccf5a7d4d2.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_2696fd0a43674afc8d88b8a762eace4e.pdf?index=true
    • https://s3.amazonaws.com/pokorevalaxex/77535755057.pdf
    • http://pinopog.rf.gd/bhp_billiton_financial_report_2018.pdf
    • http://sabepusejoponi.epizy.com/dd_5e_dracolich_phylactery.pdf
    • http://tanitiluwisiso.rf.gd/82160641924.pdf
    • https://s3.amazonaws.com/jojitagifuva/corsair_k95_platinum_xt_wrist_rest.pdf
    • https://s3.amazonaws.com/degisapemifa/52593566538.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a6.bin
d1e8baefb00b91f6d85f3ef55a9b31a001ea56bc3725287bb68181a669b6bbf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 5188 bytes
font_01_sfnt_off0001056c.bin
11400a6da021e88dcbdeeea551f9ba2cc10b5e9e112f5724489037e5dc007466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 11972 bytes

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