Malicious PDF — malware analysis report

Static analysis result for SHA-256 db304c5627fde5b3…

MALICIOUS

PDF

80.9 KB Created: 2021-03-07 23:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cf1a8719883f8cacf709694e36982a4f SHA-1: f376ea83caa545bce732e2625dd1c11720a327c5 SHA-256: db304c5627fde5b369f1bb8c6a59278214b7639ed5e953141df56ce59bfb8c5f
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The primary URL, 'https://jumiwimov.ru/strik?utm_term=nordictrack+folding+treadmill+how+to+unfold', suggests a lure related to Nordictrack treadmills, likely to trick users into clicking. Although no scripts were explicitly extracted, the PDF structure and external URI firings strongly suggest a phishing or malware distribution attempt.

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://jumiwimov.ru/strik?utm_term=nordictrack+folding+treadmill+how+to+unfold PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368469/normal_6035a599dc2fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_600f7791c6aa6.pdfIn PDF document text
    • http://art-practice.org/30617439084x62ol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_601b74fdb295d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5fe4ceb403c87.pdfIn PDF document text
    • http://kpupnov.pro/fijuruwijowedibowogwu7mk.pdfIn PDF document text
    • http://br1.red/can_i_put_breast_milk_in_dr._browns_bottles8aedn.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/womoverujutotuderifofed.pdfIn PDF document text
    • http://acupofjacob.com/graphing_linear_equations_worksheet_standard_formk0otr.pdfIn PDF document text
    • http://copyrightproblem.com/vopijitabikugositu558sa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_6044688523cb5.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/john_deere_4045_engine_valve_adjustment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_578929d2c2b14e598cbc97d0c1dae058.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toguvaju/chemical_equilibrium_reversible_reactions_lab_report_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/charity_commission_guide_dogs_for_the_blind.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/nikon_d40_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/filezilla_free_for_windows_10.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_3d7a3d630d1c4d45a557f373a6ebecfd.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_11b80c6725fa4efa93c1d6bfe83e2955.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_6fa3f7221fdb4b7bb9b5cfbc0242a95a.pdf?index=trueIn 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_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 5380 bytes
SHA-256: e7108ee6e2eb9321e0ef890927409e9f7211da32cce3173da55255fa61a38a38
font_01_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 11376 bytes
SHA-256: 3e1cfb6b6065a60948b5b116f636ea69ad69cd95c62be9ffa32f3cc4e4f0a3c7

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