Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd75240443b162d…

MALICIOUS

PDF

69.0 KB Created: 2021-02-14 11:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 640b058adc181a2aa2ab498d842bbb7c SHA-1: 35646beaea663903e28604907a43435b14c23fba SHA-256: ddd75240443b162d392ca0640a4dc6e31a804741b3254f3571e37230807c0d43
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful websites.

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://baarspo.ru/aws?utm_term=bronx+bystreets+font+free PDF link annotation
    • http://italia-doc.fun/64591047318neosq.pdfIn PDF document text
    • http://bellissimo.online/xenumuzuvolegupomaduvaragoyplp.pdfIn PDF document text
    • http://liketime.fun/apa_format_citation_article_from_websitewugn2.pdfIn PDF document text
    • http://vsedlyatebya.xyz/colorful_smoke_reveal_after_effects_templatet18gf.pdfIn PDF document text
    • http://fastdonwload.space/onedrive_for_business_and_onedriveca8ew.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/biaFher/44039110587.pdfIn PDF document text
    • http://vezdesami.ru/nadokefimisevoxirosa00qtf.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/9emcPjg/jet_jwl-_1221vs_woodturning_lathe_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/R5Y2kqx/nedukegijowolexapig.pdfIn PDF document text
    • http://herss.space/73397591768r5dr6.pdfIn PDF document text
    • https://cdn.sqhk.co/boxadiweteve/ejgPihP/texawuzovisif.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/5OEg0ha/zafapejijazugevib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_5fff15c8837e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fcc6fa571a6e.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/5jahdGf/67778802128.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/wj4iaqs/we_sing_karaoke_online_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bakotege.rf.gd/top_android_phone_games_2019.pdfIn PDF document text
    • http://baguzakanaso.epizy.com/genetiwizutolomum.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_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 4880 bytes
SHA-256: 545ce5ebec39436be2662c212ad5ec127c97d1a815a94d5201096c48e182c606
font_01_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 13068 bytes
SHA-256: 14fa9369b403151cf8109bee2633139a7be747d01adccde353709c50eddbf386

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