Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bb099017875967…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 09:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6bf16a9612ed28487a616dc12ca979a SHA-1: 94ac5eacbfddc5bb9cfdd330a193cd688adbed70 SHA-256: f9bb099017875967c83526b7b18028eafa5834c29eaccc3bdf01b87e93d2280b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to inflate search engine rankings. One prominent URL, 'https://seumenha.ru/strik?utm_term=samsung+tv+service+phone+number', suggests a phishing or social engineering lure related to Samsung TV service. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=samsung+tv+service+phone+number
    • https://cdn.sqhk.co/pajelidul/1ctEIhg/retufezutapiribawikibutik.pdf
    • https://cdn.sqhk.co/nawakema/dhiwagi/wunafubonuzikuzalozav.pdf
    • https://cdn.sqhk.co/febowozefu/ciaMffV/idle_mind_mean.pdf
    • https://cdn.sqhk.co/rinovizifim/hs2iagf/tasunalaxifu.pdf
    • https://cdn.sqhk.co/daxerarugak/jQVNig0/zemugoxoji.pdf
    • https://cdn.sqhk.co/bisuligiga/ijcidia/8215779011.pdf
    • https://cdn.sqhk.co/naxupowu/ietRhhW/dujaroxamexupum.pdf
    • https://cdn.sqhk.co/rozesivotix/Ria3WNS/xomekebonododexejododagi.pdf
    • http://nitodizej.22web.org/hcp_adquation_formation_emploi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8452a6f8-f91e-4efd-a8ba-7b9845f74b77/a_digital_asset_management_system_en_francais.pdf
    • https://uploads.strikinglycdn.com/files/f3d12ac0-bf7c-4a17-af04-0ab1e2c3f65f/animal_farm_by_george_orwell_literary_analysis.pdf
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_c42f4673283f4ff2945479b7aead6bc0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b61f235c-0731-4058-89f6-58e3cd81dad7/how_to_calculate_power_loss.pdf
    • http://vizepojuduw.rf.gd/what_do_tire_flips_workout.pdf
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_75338002442a4b119bb5a01fd03077fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b16d1371-77eb-4f56-bbb3-e2f58df41846/dufev.pdf
    • https://uploads.strikinglycdn.com/files/dd7bd6df-1c46-4310-ad4e-e54c2ae44727/bissell_power_steamer.pdf
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_d266f41a60f3403da66af7a256212d21.pdf?index=true
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_8e7ea72585b149ebb74e46ad08841229.pdf?index=true
    • http://rewelasiv.rf.gd/zexujexokuwapigepas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d6.bin
a7f5220a2509ab8ac3102bdb5cf051b03bb3822d10bb56102f97a8b94dc424f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 5500 bytes
font_01_sfnt_off0000f552.bin
4ed26fbf851a106891ce16b2b22d5c582106beda15dff9291dbfd8184980183f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10648 bytes
font_02_sfnt_off00011995.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 4324 bytes

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