Malicious PDF — malware analysis report

Static analysis result for SHA-256 a921d2be645993ae…

MALICIOUS

PDF

74.0 KB Created: 2021-04-06 16:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7b6dc29bda5aa39701abe2126ea57e71 SHA-1: 0996c72a0148b24e87b84b040efd7ba93aba95c6 SHA-256: a921d2be645993ae7c3869fd55624d0b89263047658350118fd2ab13d9cd496d
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of external URIs and the overall structure strongly suggest the document is intended to lead users to a compromised or malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=honda+2.3+outboard+service+manual PDF link annotation
    • http://jilet1.club/dragons_dogma_stat_plannerop3ri.pdfIn PDF document text
    • http://neuroncraft.online/fenix_2.0_vaper8xbb.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/faggSge/steps_to_making_pottery_on_a_wheel.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/cjjalPA/fugosip.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/tnjjghc/2729493878.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/f2B9hgB/35639476825.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/jgylhhI/90961241278.pdfIn PDF document text
    • http://shortsomfj.space/84108895882gyoo5.pdfIn PDF document text
    • http://6gusevshop.space/pakotejugagukilxu9a9.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/jihbgck/escape_game_50_rooms_2_level_28_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/gesjcJE/dejuputif.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/UQ5Mhhn/2007_chevy_avalanche_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/yijUjjQ/texas_holdem_poker_online_free_game_download.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/the_cars_you_might_think_sheet_musicnsopa.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/iiheUih/kexitur.pdfIn PDF document text
    • http://rent-nout.site/elfrida_primary_school_ofsted_report52wnr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90e4a81-1472-4eb9-b46b-2b7428ea1bf2/guidelines_for_the_development_of_shipboard_oil_pollution_emergency_plan_sopep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08b29c66-7f2c-4b68-ad35-5a428197ddb6/24649235229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094afb0b-da1e-495e-92ba-d395aec5be91/how_to_stop_sensor_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a490a1-09c3-4892-ad9b-27a8a9b78e1e/63328678211.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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 5576 bytes
SHA-256: 5429fd4b0648c08c9c8480d2d8c277b5572464cc8039a90e035118f2e8077dad
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10512 bytes
SHA-256: fbabe5225dc3857a1ad8433cb68260d722b3ce2e8fe0dc653e34086a90b99ab1

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