Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5dd64ce2eeb0889…

MALICIOUS

PDF

87.3 KB Created: 2021-04-06 13:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d15e58eae4b56c6594794482d9109f24 SHA-1: 4066259538c5bce85b087d7da6fcc21f8cb4258a SHA-256: e5dd64ce2eeb088934142c28c85aa878598b4788ba44f3bbb34de88f7aef1064
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with several pointing to disposable hosting and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver second-stage payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=bossy+song+2019 PDF link annotation
    • http://vowubomirasupem.22web.org/wearable_king_crown_template.pdfIn PDF document text
    • https://gavurefeg.weebly.com/uploads/1/3/1/0/131070452/8ae508a2b919a1c.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/a4yyQij/bomb_has_been_defused_mp3_download.pdfIn PDF document text
    • https://likobikumenaf.weebly.com/uploads/1/3/5/9/135961418/b69bbc4a.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/tutorial_for_java_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/Pvxioih/neo_geo_mvs_arcade_cabinet_for_sale.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/montreal_cognitive_assessment_test.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/peruvian_gamefowl_fighting_style.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/jalav.pdfIn PDF document text
    • https://cdn.sqhk.co/zafazegig/5gid7ia/brinks_security_light_manual_override.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/what_is_creative_abstract_photography.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/44668334672.pdfIn PDF document text
    • http://tokofom.rf.gd/rojovuxutujad.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/sample_excel_sheet_for_expenses.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/buxogefowo.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/70240123798.pdfIn PDF document text
    • http://kololujes.rf.gd/71266478045.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/schlage_combination_lock_not_locking.pdfIn PDF document text
    • http://lipidojomodu.rf.gd/lanasuxavugijemijoruveko.pdfIn PDF document text
    • http://rereroma.epizy.com/runexoseronowesinuno.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_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 5148 bytes
SHA-256: f9a53d6499cc76c9e43b1cc031239e8105d528543485bbdcc32ed8aec73d8104
font_01_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 12912 bytes
SHA-256: d6bbfae7c50ee14aa1700de2a725cbc5b023a127c9d706a8b7304dd78d20c02b

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