Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39bddcefda90b7b…

MALICIOUS

PDF

79.4 KB Created: 2021-05-11 20:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98035b09c694dbc13efc04b73042b3bb SHA-1: b7d97331977e0f6acceacd95327111413fed2960 SHA-256: d39bddcefda90b7bf596b32dc25b364c82b4dfa36b8c91008fc764ef16f232ce
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is associated with a phishing attempt. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=online+booking+software+ratings
    • http://gixipures.sportsontheweb.net/pabonebakukitapu.pdf
    • http://pugezesiw.mygamesonline.org/how_to_do_cognitive_behavioral_therapy_for_anxiety.pdf
    • https://cdn-cms.f-static.net/uploads/4405651/normal_606a33b8c4c63.pdf
    • https://cdn-cms.f-static.net/uploads/4490542/normal_600bf3f0e90ae.pdf
    • http://laketofetujeso.medianewsonline.com/71082863228.pdf
    • https://static.s123-cdn-static.com/uploads/4410186/normal_60063f739cded.pdf
    • http://thecaffeinatedstudent.com/frigidaire_commercial_freezer_owners_manuali3ihi.pdf
    • http://tufuwavaziga.mygamesonline.org/66398287763.pdf
    • http://mirumumavetifun.mypressonline.com/basics_of_communication_engineering_free_download.pdf
    • https://cdn.sqhk.co/kovajivika/jhh24jc/business_tycoon_simulator_2016.pdf
    • https://cdn.sqhk.co/kovixileta/jaifAHS/royal_caribbean_international.pdf
    • http://am-sound.ru/884150091746sah0.pdf
    • http://sifuzifixezija.medianewsonline.com/math_quiz_bee_questions_and_answers_for_grade_5.pdf
    • http://biribekagupelu.66ghz.com/tobelosemabulegekowobe.pdf
    • http://fuzubijixulux.mygamesonline.org/merry_gentry_a_shiver_of_light.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://likutolejit.onlinewebshop.net/16129276031.pdf
    • http://jidoxib.rf.gd/69851675138.pdf
    • http://webeputexewek.rf.gd/latewezexu.pdf
    • http://turojupa.epizy.com/brahmanical_patriarchy.pdf
    • http://bogalibamadom.myartsonline.com/93399896339.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_off0000fb50.bin
392ad6ec9356b5eb7a9d599ca5ff5b564f147fcd4827d87c756fcc75db851672		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 5256 bytes
font_01_sfnt_off00010d60.bin
90f13661a0686b28e633737f4b52271f33d95d5d08cc526ef37a41a1ebac4300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 10328 bytes

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