Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e85c5bc81dacbbd…

MALICIOUS

PDF

71.3 KB Created: 2021-03-30 09:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6ac48a9059f0c2ba97d402c378abaeb1 SHA-1: e33069a1580567905ceb5125dda26d5aabe4c397 SHA-256: 5e85c5bc81dacbbda2c5127c3e9a43c33a7cd540a639d63dc7bb82a39cbfa838
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

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
  • 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.
  • 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://mezovuduw.ru/award?keyword=romeo+and+juliet+act+2+test+pdf PDF link annotation
    • https://cdn.sqhk.co/sawibevas/jijgbhc/wedding_spreadsheet_ideas.pdfIn PDF document text
    • http://milatepe.medianewsonline.com/bhagavad_gita_tal_y_como_es.pdfIn PDF document text
    • http://studyweb.site/chatterbox_template_word_document4usdk.pdfIn PDF document text
    • http://znasila.ru/52426391724qbjyk.pdfIn PDF document text
    • https://cdn.sqhk.co/webaxepibi/cFjhxgh/gewuvaxonet.pdfIn PDF document text
    • http://tixanijematewe.mypressonline.com/batch_manufacturing_record_format_for_capsule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_604fcdf7e36a4.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/jgF50jb/ganemodewesozadisanejo.pdfIn PDF document text
    • http://tapopapebesawu.getenjoyment.net/94594470746.pdfIn PDF document text
    • https://cdn.sqhk.co/defegitip/t2ihjf6/dr._babasaheb_ambedkar_serial_title_song.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/Z5gg38V/gipovagutolevikagomuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_602d797a7e8f9.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/dMFidOa/angry_balls_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/6ihxgh1/92902227337.pdfIn PDF document text
    • http://useplafond.xyz/black_and_decker_electric_trimmer_edger_partsql6bi.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/5cDjhvf/76626547429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 5420 bytes
SHA-256: bfd844ebd3cdff4d1cba12798e2f7f58c379fb3fa8d5b1e2cbe38c35ec374dca
font_01_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 11052 bytes
SHA-256: 7e418aa93c4a5e068e41e09c7aaa1ff9b05f5f801684a44dbe5a5ef038f577ce

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