Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cf97f9253969df…

MALICIOUS

PDF

72.1 KB Created: 2021-03-17 07:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3e5d12cacfa93672e9fdb4f72ca88d SHA-1: 3da87b821568a1dad36fc80a313e16f183d9b3f7 SHA-256: 86cf97f9253969dfb3ce19419dae8ab0bc435a6db8232291d82f479a00165329
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary suspicious URL hosted on disposable infrastructure. The document body, though heavily obfuscated, suggests a lure related to academic literature, which is a common tactic for phishing or 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://midufefew.ru/strik?utm_term=review+of+related+literature+apa+format+sample
    • http://lnstagrambusiness.com/15743953772wm6ar.pdf
    • http://vatidenow.medianewsonline.com/bertram_g._katzung_basic_and_clinical_pharmacology_14th_edition.pdf
    • https://cdn.sqhk.co/purizepore/3udQC9Q/management_consulting_salary_deloitte.pdf
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/taxujiniw_lamepibibadesux.pdf
    • http://fudazozotakaxal.mywebcommunity.org/48825183078.pdf
    • https://cdn.sqhk.co/gapalagabig/iYZieTZ/beduzemasuwojam.pdf
    • https://cdn.sqhk.co/vovawumusa/jjvjbtS/black_friday_walmart_tv_2020.pdf
    • http://jushq.pro/84052790637jmayt.pdf
    • https://fukefaxetudaze.weebly.com/uploads/1/3/2/3/132303366/562471.pdf
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/mulut-xivokamokego-zanaganigud.pdf
    • http://nakozek.mypressonline.com/m.sc_computer_science_books_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_116f120660b64cd18f19042de63252f0.pdf?index=true
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_cf089043d4184eaebb1962cd6c17b70d.pdf?index=true
    • https://s3.amazonaws.com/zedilegol/tizikiwezo.pdf
    • https://s3.amazonaws.com/kumasala/epson_xp_320_black_ink_not_printing.pdf
    • http://xakagigoneliv.myartsonline.com/37114342021.pdf
    • https://s3.amazonaws.com/bupaxomu/berserk_manga_chapter_360_release_date.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_off0000dbfe.bin
8f3470305bf6c50375c6b9c84003a41d33705b2214520ffa529a0befdb9aecae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 5348 bytes
font_01_sfnt_off0000ee32.bin
af5a7ddb6021e2f7a7f57669cd84e5b27a35c8c78b5e62554f2e8317d272115f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 10828 bytes

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