Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baa7f8104213401…

MALICIOUS

PDF

71.3 KB Created: 2020-11-11 23:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: daa0f6928f741fe27b4782eeb74785d6 SHA-1: badc45aff9b4dc82e6ea0f3b30a2b1980b782878 SHA-256: 3baa7f8104213401501506adfa3bf687294bbc0cd10c2d4e4a262b37edf5b2cf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/123?utm_term=distress+tolerance+worksheet+3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5f8b7bfad51f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f9af51b1c1c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5f977b9b8d62e.pdfIn PDF document text
    • https://janokapaw.weebly.com/uploads/1/3/4/3/134329878/jukobiparomuk.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/59954695fb989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fa367eaf3d65.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/mizir-gamixelotunat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_5f9eca8a29e4a.pdfIn PDF document text
    • https://wakejowedab.weebly.com/uploads/1/3/4/5/134599651/424533511753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446499/normal_5fa5b71f10626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9f7356e5-e4d9-4d5e-88ba-738a9935a70f/citrus_fruit_that_starts_with_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb4a738-1596-4104-a4d5-8e2cc933cdc8/67903473933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67309e0-c589-46cd-a495-cfd2b1b797ee/puniruvopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f716dad-1f93-44fb-9d04-4ed5d83ef5f1/73825982690.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 4992 bytes
SHA-256: 33a5960d5d9bd3be2b343f3d78725fa0eeeb387aac138e588fd3f0be6fc7d7e6
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10260 bytes
SHA-256: d982706be88c6d1cc277f84eb42ca2c0f204698f859dba097c72fc33330ada58
font_02_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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