Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b34161ed7d923e8…

MALICIOUS

PDF

74.7 KB Created: 2021-03-18 07:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a63b8c4c8807fe833bc4b32e51934e SHA-1: d3261da59ae16f188a05cd5594023abd8565bd6f SHA-256: 9b34161ed7d923e84be398dc6514b01b04e7dd6de5c5a934988c22675fb66c32
96 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 an embedded URL that impersonates educational content, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URL indicate a likely initial access vector via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=mcgraw+hill+connect+biology+answers+chapter+11
    • https://cdn-cms.f-static.net/uploads/4462696/normal_604033acd690d.pdf
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6041aa2b5bd6c.pdf
    • https://cdn.sqhk.co/tivuzofep/iin4Mgg/lisobemawedoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4422877/normal_6015397033ef3.pdf
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fd991e9eb0d5.pdf
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5ff4ae9971528.pdf
    • https://cdn-cms.f-static.net/uploads/4454821/normal_5fd96126a27be.pdf
    • https://cdn-cms.f-static.net/uploads/4459188/normal_600bfb57bad6f.pdf
    • https://cdn.sqhk.co/pifizumux/aU3hKlf/8020868460.pdf
    • https://cdn-cms.f-static.net/uploads/4495976/normal_5fdbb7be30068.pdf
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5fe277db01fa0.pdf
    • https://cdn.sqhk.co/faxinomitux/ih3hahe/boo_2_cast_youtubers.pdf
    • https://static.s123-cdn-static.com/uploads/4379964/normal_5fe4a35c820d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fixararololu/rosotezajutafefuba.pdf
    • https://s3.amazonaws.com/jagux/example_letter_writing_formal.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/pneumonia_acquired_in_the_community.pdf
    • https://s3.amazonaws.com/sebunuzu/simple_crochet_slippers_for_beginners.pdf
    • https://s3.amazonaws.com/zodawanuror/55360533668.pdf
    • https://s3.amazonaws.com/jefobexapulow/auditions_vancouver_actors_guide.pdf
    • https://s3.amazonaws.com/bufexa/bloodborne_skill_bloodtinge_guide.pdf
    • https://s3.amazonaws.com/vukusa/bizolibotafadazorotipoku.pdf
    • https://s3.amazonaws.com/pirofopafu/vupikup.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_off0000e3e9.bin
4aba172b727be4646eaef48dcb04d3cc1f7c116252d1cba3ac7d594f0864955d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 5588 bytes
font_01_sfnt_off0000f712.bin
5dbaafc97bd188c32f9b7c8524c0b94bda97fef08330d60c1aaefff285df8c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 11156 bytes