Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8ddf88a052833c…

MALICIOUS

PDF

71.3 KB Created: 2020-12-24 03:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6f0f09631232d8ca6250f47d5ef3042b SHA-1: 9d7d82211243b3adb9a5f57bff29673ca8d26de9 SHA-256: 3d8ddf88a052833c228a6e56fbb782f90495272c0dfd379b746bc72f559c5d4e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links. The ML classifier and ClamAV also identified it as malicious. The primary attack pattern involves directing users to external URLs, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=pathfinder+scarlet+throne+style PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5f87267111631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5fc3031228000.pdfIn PDF document text
    • https://sawobefuridavo.weebly.com/uploads/1/3/4/8/134895752/vurelalujados_duvugodisi.pdfIn PDF document text
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/4967835.pdfIn PDF document text
    • https://zixamagexiwu.weebly.com/uploads/1/3/4/0/134012381/nujig_pogokezofutef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467004/normal_5fcdf78603cc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fa37badf2a3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_5f94fd90ad07d.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/nejalabobuxirije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5fadad1997be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fd8c4683e76c.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/muxegeza/old_snowmobile_tracks.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/automobile_mechanics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578dc7a9-1941-4c5f-a170-921a20dcf7c3/weighted_hula_hoops_for_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/roxaruwegan.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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 5212 bytes
SHA-256: 7a931093cc1d4ae5ad23275d53e83e473bceeb4daaf00ed901d36eedddb70396
font_01_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 10956 bytes
SHA-256: 4383165c43ff50c23e994356766f1ee5a227a333426c3f575deb300d8def3d77

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