Malicious PDF — malware analysis report

Static analysis result for SHA-256 8683be0b74d635b3…

MALICIOUS

PDF

71.6 KB Created: 2021-04-18 18:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5d35cce711d0d3fd86f363dbc548ec04 SHA-1: b29f4bef0c73c91f0eaa5212d121952ef32f1283 SHA-256: 8683be0b74d635b3272436cb8f717bdecab3304b8c0ae634cb8067b78a01a350
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm on disposable hosting. The primary malicious URL identified is fokemale.ru, which is likely used to distribute further payloads or phishing content. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=moon+river+ranch+texas+for+sale PDF link annotation
    • https://cdn.sqhk.co/modurasisuwu/gjWibjg/real_football_2020_offline_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_6023bc8c49cc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405907/normal_5fcd6ca3413f3.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/nidgigc/star_wars_jedi_fallen_order_gameplay_part_4.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/3hdjgeA/tipefulenodedupalaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_600ce682123b8.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/iUyggMF/anaconda_2_movie_mp4_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_6060f4db94261.pdfIn PDF document text
    • https://cdn.sqhk.co/kekazorub/uhaKugh/lyrical_dance_costumes_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/QGhgzRk/nail_art_without_tools_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/gimjbja/suzemaleliritisil.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/Jchjia0/31679436484.pdfIn PDF document text
    • http://degujub.iblogger.org/tuluremidaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_602aea7e1aa6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefotuja.rf.gd/nuberinowesabawoliroti.pdfIn PDF document text
    • http://rujifejoju.rf.gd/mugizagozopa.pdfIn PDF document text
    • http://zimewukefaja.rf.gd/saying_numbers_in_english_exercises.pdfIn PDF document text
    • http://wejifofodig.rf.gd/saluxux.pdfIn PDF document text
    • http://xezipunefosipu.epizy.com/nozibofovuro.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/homelite_super_ez_chainsaw_owners_manual.pdfIn PDF document text
    • http://lirejomirun.epizy.com/cet_2020_karnataka_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/86194266218.pdfIn PDF document text
    • http://vivotes.rf.gd/maliwulopamewavufaku.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_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 5100 bytes
SHA-256: 5dcdc91a738cca3796a95fde9cbd3976e9d480402a125a6712746b4df890e241
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10888 bytes
SHA-256: 309c01211b041a1cf0ae3d4c5d2155abc42abed43a59feb26866910f07b19d52