Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e88a57bfe52e89…

MALICIOUS

PDF

77.7 KB Created: 2021-04-26 21:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4578a27097db9b41c820597e630d78f SHA-1: 7779152a77a3dd24020fc5aa4c7f553671036a71 SHA-256: a5e88a57bfe52e89d915676b27d5b62011bbc23307f1976f17435271169ff105
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru' which is likely a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing lure. Although no scripts were explicitly extracted, the presence of multiple external URLs suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=power+probe+3+master+kit+reviews
    • https://cdn.sqhk.co/revinoxu/widSNgj/52271580263.pdf
    • http://vevebopawo.mywebcommunity.org/gastrointestinal_system_notes.pdf
    • http://instasale.company/panasonic_kx-dt343_voicemail_password_resetoj02t.pdf
    • http://tosefabebiribow.scienceontheweb.net/pdf_split_merge_download.pdf
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5ff02f9c89a0f.pdf
    • https://cdn-cms.f-static.net/uploads/4482230/normal_600a793911139.pdf
    • https://cdn.sqhk.co/bodorosuzuta/jj917gh/24897973077.pdf
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5fef8414a51ef.pdf
    • http://hookup157.site/45563189163afhsd.pdf
    • https://cdn.sqhk.co/jatobeguji/dhWjaia/zoxulokipujavizakalidene.pdf
    • https://cdn.sqhk.co/nilamemiw/igLjjgg/58759314127.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zotubune.myartsonline.com/adobe_audition_cc_midi_keyboard.pdf
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_31faeddadca14869975130be008b5f92.pdf?index=true
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_2f40fe6ac2694bf6893a255c39205913.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6459a52-6c7f-45b0-b281-2c9d8a5042ec/fubapujexomegeta.pdf
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_b69e8794563c4dfbb9b86b692b86814e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f98c6512-1b28-4a3d-b7f5-a24f1d916bb2/the_apology_of_socrates_questions.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_off0000ef1a.bin
a5ea67e5b2f3d261ce608f54c4c561373d443604cf4ed6bdea63e95438bbaaba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 5456 bytes
font_01_sfnt_off000101a7.bin
66554d89691f026118feefb8ff39cf9e1bf0bbe6c9ff0f9c5eed38e2249b3f73
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 11752 bytes