Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab081d11dbeca337…

MALICIOUS

PDF

86.2 KB Created: 2021-03-09 01:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f815cc1a09abdb4728aee0b5009f21d2 SHA-1: 82690c1ae42a82e93bdb53a5e17d760732c007cf SHA-256: ab081d11dbeca33752185d6db0a1c659ed409e68c5740df6937d7368acd985ff
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/wix?keyword=meg+steve+alten+pdf+espa%25C3%25B1ol
    • http://3gusevshop.space/exercise_32_anatomy_of_blood_vessels_fetal_circulationxmd81.pdf
    • https://cdn-cms.f-static.net/uploads/4482230/normal_602b0c2284ec1.pdf
    • http://rimiminigi.22web.org/full_marks_guide_class_8_sst.pdf
    • http://vumexovuvelafe.medianewsonline.com/girl_interrupted_daisy_eating_disorder.pdf
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6015e1498c01d.pdf
    • https://cdn.sqhk.co/rojawamusula/bhdAidI/rutaru.pdf
    • http://dream-stat.ru/monitoring_and_evaluation_ebooks6vxy.pdf
    • http://sawedes.mywebcommunity.org/brother_mfc_7340.pdf
    • https://cdn.sqhk.co/lidabofob/cDygiaD/11021832902.pdf
    • http://gisoboxizaza.mygamesonline.org/evh_5150_iii_lbx_ii_settings.pdf
    • https://cdn.sqhk.co/banamasuvaj/f4yh9ij/late_90s_alternative_rock_hits.pdf
    • https://cdn.sqhk.co/luwesefizi/haBhigT/download_game_my_talking_dog_mod_apk.pdf
    • http://jegotaraxipux.iblogger.org/92844590684.pdf
    • https://cdn-cms.f-static.net/uploads/4418970/normal_603d514a2b84f.pdf
    • http://rebibedo.mywebcommunity.org/best_romantic_comedy_novels_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4481695/normal_604630bcc6468.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wovutemikinodow.rf.gd/88044493641.pdf
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_4789dd8f963a4d94b6d56d79b1688cd4.pdf?index=true
    • http://zevusup.atwebpages.com/30830593306.pdf
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_aca8fc5b3f9c4b27b462237fc564afaf.pdf?index=true
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_cd35bd1be1144a7dbb965577a9a22be3.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_136997ae5ea44157a73935ff5bdfda1b.pdf?index=true
    • 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_off00010540.bin
a56826ae3acf4397b25c58e863a6dbd3e4750c401ae690be301315be9ec50b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 5132 bytes
font_01_sfnt_off000116a0.bin
f8d1d8c8ea9f01160cda42df60465eb9efee1ecff47064f4b9384610f80afa49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 11384 bytes
font_02_sfnt_off00013b85.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B85 4324 bytes

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