Malicious PDF — malware analysis report

Static analysis result for SHA-256 def97038096c5210…

MALICIOUS

PDF

69.7 KB Created: 2021-02-19 12:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 39ae4a51dc2a002e6f9c21d678105060 SHA-1: 9cdd66384a5ac3b42288c3dbd9708660587b9940 SHA-256: def97038096c5210d601f00bcaa5eaf1769f89a72a535a5a5872f3f1e3b3a61b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://druttle.ru/wix?keyword=iptv+apk+android+4.0.4 PDF link annotation
    • https://cdn.sqhk.co/radojiga/fiaiaoM/fevaferisuxazukuzejidizo.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/7yNXmwW/rubem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5ff8f75c9c609.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gVCxIYU/jewejiduvediwiwuxekimen.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/rexepekevulevaperud.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/zusod.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/cXjdoii/pasemufitom.pdfIn PDF document text
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/jukijokazowavu-wevaroxijidav-wirivuwuk.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/jj9iigg/nba_hoops_basketball_arcade_game.pdfIn PDF document text
    • https://reralifinopu.weebly.com/uploads/1/3/4/0/134018386/xomepiwitij.pdfIn PDF document text
    • https://sanositew.weebly.com/uploads/1/3/1/8/131872303/1786d8f2442.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/jinabom/bodyworx_treadmill_jx300_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC240 5064 bytes
SHA-256: c604da204e875770d01e7afafe3dbaadb361b9f5aa26f56950eaae4b27c82d33
font_01_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 9780 bytes
SHA-256: 2fe70748f68f068a382921351f65fa08fb960d8202963b074ea62cceb94d7e10
font_02_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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