Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6143832bcf69a3…

MALICIOUS

PDF

75.2 KB Created: 2021-02-22 03:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 33db41eb48b35259b8ad72767872c78b SHA-1: 59bf79574457e038739ff5be1f2085dea29e33f1 SHA-256: 3e6143832bcf69a3300731cf9dfb03cd61ce0c57e7bbe6d65edb09a9520a4070
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://crophysi.ru/strik?utm_term=mixing+and+mastering+course+fl+studio'. Additionally, it exhibits characteristics of a PDF link farm with numerous external links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=mixing+and+mastering+course+fl+studio In PDF document text
    • https://cdn.sqhk.co/puwukuwos/dXghhjh/90445692828.pdfIn PDF document text
    • http://s7hmus.org/rwby_fanfiction_jaune_abandoned_by_friends15iv0.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/Jhahhjh/duromekegim.pdfIn PDF document text
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/5180426.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/VnzdCf5/risomafam.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/f12a4U0/wobezaranol.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/8447252.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/gia8jiR/chapter_4_quiz_answers_chemistry.pdfIn PDF document text
    • http://tekplafond.xyz/41064656885yw84o.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/Lgdghgh/icing_on_the_cake_baskin_robbins_calories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/9348648206.pdfIn PDF document text
    • http://jojajixinoxu.epizy.com/16527659923.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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 5416 bytes
SHA-256: 99cf5464be7200c06fcbed0e789f67bd678fd9b876932b5b699e7ca3e8e941ba
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10856 bytes
SHA-256: 992f5cb7af882c635d5afc6cc291514a41a12089c5fc7ffb3f71744bcf3db26c

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