Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e705549967fab9…

MALICIOUS

PDF

149.0 KB Created: 2021-04-10 05:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 76fe5b2b5d08f06f411a2d054cf5df99 SHA-1: 438cd787f75f074ed829fcfe0b44d90c222951ac SHA-256: d7e705549967fab956e71051695685b9bfedb3bbf6134930492398b5ed0fbef3
206 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to an 'Office 365 user guide'. Heuristics indicate the document instructs users to enable macros or editing and provides password instructions for an archive, common tactics for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gimoguvi.ru/strik?utm_term=office+365+user+guide+pdf PDF link annotation
    • http://zuzatew.medianewsonline.com/duzofilurenuwadiveposiv.pdfIn PDF document text
    • http://setlyb.online/mmse_cutoff_score_for_dementiahfibt.pdfIn PDF document text
    • http://wegoradubi.sportsontheweb.net/composition_and_structure_of_atmosphere_notes.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/fasenaka_nutalivezulama.pdfIn PDF document text
    • http://topmassage.net/harcourt_6th_grade_math_book9jrie.pdfIn PDF document text
    • https://cdn.sqhk.co/perolurowona/ifUrihu/kajoj.pdfIn PDF document text
    • https://xizevidunofi.weebly.com/uploads/1/3/4/3/134321119/2668114.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/ftiaagd/79432230483.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/c2jg6hi/87188113025.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/schma_anatomie_du_coeur.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/njihdge/famous_civil_war_generals_union.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/hfQhbYu/maxepobefuvatotobov.pdfIn PDF document text
    • https://doziverilobeku.weebly.com/uploads/1/3/2/6/132695566/1509613.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/NZicmjh/2487984778.pdfIn PDF document text
    • https://cdn.sqhk.co/tupizurelir/djdBARn/bullet_hell_survival_games_ps4.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/beps_action_5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_20aded6b5af549f3b5a580221d9a6d8f.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_3c8ca342c80041708c3d4bacd8111245.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_7f713551032a41e2a02cc98ec73f8152.pdf?index=trueIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_3a093263c97944f183b07d8d28e89f41.pdf?index=trueIn PDF document text
    • https://03234a85-d811-4a68-a1f9-f7315bf9ccb2.filesusr.com/ugd/079591_49eb785c451a4e92b0f8301de6688842.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_off0002096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2096C 5552 bytes
SHA-256: 0073c41ce974b0b310c2dc533d05b5a72c329c5c0d0a6725f23905d0bc36c92b
font_01_sfnt_off00021c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C59 11848 bytes
SHA-256: 4ce68f1b2e5f44081eeba0c5256ab1a5f7509ae4212d929d756f9dee760a95dd

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