Malicious PDF — malware analysis report

Static analysis result for SHA-256 919fcb4398986924…

MALICIOUS

PDF

76.5 KB Created: 2021-03-22 05:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1dcf3522a21c3c41e614ef410721ea8f SHA-1: 21743daf1cae7a0e61dbea63a3ba25ccddfbdbd0 SHA-256: 919fcb4398986924afe5b90264566de5a2587b28e6ece28a78eba6da23f65795
184 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and is flagged by a machine learning classifier and ClamAV. It embeds URLs pointing to known malicious redirector infrastructure and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware delivery attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=the+birds+nest+lafayette In PDF document text
    • http://pl50off.info/40975642299et2tr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_603d1645d4f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_604d61c4d5c53.pdfIn PDF document text
    • http://krokoboko6.xyz/agile_methodology_scrum_vs_kanban0kqvo.pdfIn PDF document text
    • http://pannochki-art.com/kuvetawarowagujumapowajtsvbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fe880bf432a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_601b2282c34a7.pdfIn PDF document text
    • http://clientesdkb.com/43050251099fj8hs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421959/normal_5fee47b876b3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tidizovebimike.epizy.com/cheat_engine_6._5._1.pdfIn PDF document text
    • http://jejotatimub.rf.gd/wuromozidikagoveresoti.pdfIn PDF document text
    • http://jinesiwi.epizy.com/70417176093.pdfIn PDF document text
    • http://kesekerezox.epizy.com/california_driver_handbook_2018.pdfIn PDF document text
    • http://bujetazufukuv.rf.gd/birthday_songs_punjabi.pdfIn PDF document text
    • http://tivapatovike.epizy.com/fefugodamu.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/47187424820.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/xmanager_passive_free.pdfIn PDF document text
    • http://visititeralu.epizy.com/what_does_the_boy_face_emoji_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/clinician-_administered_ptsd_scale_caps-_5.pdfIn PDF document text
    • http://sewugobavi.rf.gd/2566722905.pdfIn PDF document text
    • http://wekujugom.epizy.com/xigavukudofagonekupefi.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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 5184 bytes
SHA-256: b379633f2e5b939b5e290d94e91b95926ede56b0b2f8b7d1e13aa868d0330fef
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 10696 bytes
SHA-256: 0a86516cbf2f75f40a343b88bba2046c6777a623a8fea7e4bf29802b6585af8a

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