Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3aad0373d7343c7…

MALICIOUS

PDF

75.9 KB Created: 2021-03-18 23:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d014971937948bb27b78d80303afbe9 SHA-1: 55f885e0316f210ca7d791ec1d2722b0477517b1 SHA-256: b3aad0373d7343c72bb6ce752ca67440a79ca6d9307fdeab80b97a524fb59208
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a mass external PDF link farm. The primary URL, https://jumiwimov.ru/award?keyword=aldi+nord+prospekt+diese+woche+pdf, is likely the initial lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to redirect users, potentially to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=aldi+nord+prospekt+diese+woche+pdf
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fe00fd9eab25.pdf
    • https://kesuwevibumeju.weebly.com/uploads/1/3/0/8/130814845/zosotese.pdf
    • https://cdn-cms.f-static.net/uploads/4383314/normal_6032f2f5afca6.pdf
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/83bd0e7a9509.pdf
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fdae46ed7124.pdf
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/4435559.pdf
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/29d4e0.pdf
    • https://cdn-cms.f-static.net/uploads/4461484/normal_5fd11c348ebf6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_57a30d486b37472da71d1e4ae41d2c8c.pdf?index=true
    • https://s3.amazonaws.com/datarofapakil/86738338898.pdf
    • https://uploads.strikinglycdn.com/files/457ddacd-b4ee-4bcf-acfe-4d18da0ca8b0/what_age_are_the_warriors_books_for.pdf
    • https://uploads.strikinglycdn.com/files/bce39a15-210e-476d-b93c-0d30299c73c5/warehouse_safety_inspection_checklist_uk.pdf
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_19698897a2284c448f4368f786f85c5b.pdf?index=true
    • https://s3.amazonaws.com/toguvaju/savage_tide_pathfinder.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_84f85308fa0a44c29c6f999b718d0864.pdf?index=true
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_0219b5cdaee3421080d663ac5dae9c20.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6931226-1222-4143-8bd9-208f86561d1e/52608284624.pdf
    • https://uploads.strikinglycdn.com/files/dae7a32c-6951-4b6f-830a-15b80bee734e/lg_monitor_repair_service_near_me.pdf
    • https://s3.amazonaws.com/kotodur/army_cadet_uniform_west_point.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_8548c3c6bff64743b12d3b65d28a7dfb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea774432-7518-4005-86fe-a4d9829ac8db/optiplex_755_sound_drivers_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/4dc110e4-0e8c-4e89-99b8-a20bbd17ff2e/mukaja.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e686.bin
b772c72f21235278dd467ecf8c99cd2dc266cc265dae0150692b65429f199200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 5180 bytes
font_01_sfnt_off0000f837.bin
c94f4a7c047c0ce536ad65921cbf1f8f6032da84813c401d135e22f1b057ffd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 12332 bytes

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