Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e9bc90f9d6d6be…

MALICIOUS

PDF

76.8 KB Created: 2021-01-19 02:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 785d97631683cb0aa875a1172508d2db SHA-1: d35f4c182a1e4e4da97c624daba2ae01bd5e01cc SHA-256: f7e9bc90f9d6d6becf0aef9910ec77a5ab326706d442b995edae66fa9fca653f
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. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a probable attempt to redirect users to malicious sites. The document body, though partially obfuscated, suggests a lure related to historical events, likely to mask the malicious intent.

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://trafffi.ru/123?utm_term=how+did+militarism+contribute+to+ww1 PDF link annotation
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/fosofiresisebisifeko.pdfIn PDF document text
    • http://wexixexebasober.22web.org/nemel.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/frjcicq/hocus_pocus_costumes_party_city.pdfIn PDF document text
    • https://cdn.sqhk.co/zivunegas/hc5jjyQ/bad_day_at_work_gifts.pdfIn PDF document text
    • http://vovevowumusiki.iblogger.org/78585606239.pdfIn PDF document text
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/labofuso_sarakot_safapesod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poziluxolebulu.epizy.com/93690465897.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/26768040229.pdfIn PDF document text
    • http://fujesotes.epizy.com/best_bike_racing_games_for_android_2019.pdfIn PDF document text
    • http://jipokogave.epizy.com/felagokugujufu.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/30980055122.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/minecraft_story_mode_door_puzzle.pdfIn PDF document text
    • http://moliposapivar.epizy.com/93109270733.pdfIn PDF document text
    • http://tivogowajap.epizy.com/vebifemeduwowekimixomip.pdfIn PDF document text
    • http://veluvuwipigunuw.rf.gd/rafawepirudisezulujo.pdfIn PDF document text
    • http://totofexux.epizy.com/relative_afferent_pupillary_defect.pdfIn PDF document text
    • http://molodetagako.epizy.com/bapcor_limited_annual_report_2019.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_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 5332 bytes
SHA-256: 3376f12256e2f1f5b79b0da7db279c594c00d0869138bd1a58caf4743b4abf3e
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10632 bytes
SHA-256: 3034b1c332838dcacfba738a1c93dbeae827891386c831cae0708c361370c286

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