Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff706788daa83e00…

MALICIOUS

PDF

72.4 KB Created: 2021-04-23 02:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cd970d815c902d2bf64f6736e2498b9 SHA-1: 30b414ecbefb0ae8cdc0f47985d9186d75f7a5ca SHA-256: ff706788daa83e00ec4eaea299bfc5aee4da4607e241877c7c92a07466c6232b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, characteristic of a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=what+is+considered+a+constitutional+democracy+do
    • https://cdn.sqhk.co/bulenupulabo/hhdiiSE/billie_eilish_instagram_password.pdf
    • https://cdn.sqhk.co/zikufivol/chdLCtU/13548490747.pdf
    • https://cdn.sqhk.co/suwajipufo/Wfngdgi/adosphere_1.pdf
    • https://cdn.sqhk.co/jogepirar/Thgjihd/disable_long_press_home_button_android.pdf
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/19edc1e172b6f.pdf
    • https://cdn.sqhk.co/daborofus/gR5hphd/ninja_awesome_game.pdf
    • https://cdn.sqhk.co/rurufimibiwe/k1haKjg/cruise_jobs_australia.pdf
    • http://rotawafuwuno.scienceontheweb.net/lalenesuviwi.pdf
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/nilidejekiv.pdf
    • https://cdn.sqhk.co/lekixubegewo/ja0iahb/xepavagojedefemer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sewujajapivix.onlinewebshop.net/16614731988.pdf
    • http://koxolavomuzo.myartsonline.com/73226615357.pdf
    • http://rajixubododafu.epizy.com/22381123372.pdf
    • http://zudozam.epizy.com/abu_catholic_songs_audio.pdf
    • http://xujalupa.epizy.com/disney_medley_piano_sheet_music_free.pdf
    • http://vutitogox.epizy.com/dell_inspiron_e1505_restore_to_factory_settings.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_off0000de02.bin
6dc481d1ba5faf0c06acf2731242ffdeda56539f02334ef28e1602d5d1c5d516
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 5292 bytes
font_01_sfnt_off0000efe7.bin
fb862447db98c5ca68b31919f269468e440d20df4e456734770dab3994f25c91
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 10748 bytes