Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0f89560c2b9d0d…

MALICIOUS

PDF

85.4 KB Created: 2021-03-24 11:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4c35cd864bffaee5f2a37b93496f78f SHA-1: 80f2c78adcf1648c85447478f8092575ce7b7834 SHA-256: 6f0f89560c2b9d0de304ecae301d6d9ee964e16f8bb2821aa45dc2ca0b4648e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to potentially malicious or phishing sites, and the document body, though heavily obfuscated, contains references to product names and application details, possibly as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=duraheat+kerosene+heater+igniter
    • http://frut-tree.site/flying_car_transport_simulator_apkfeai4.pdf
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/6857760.pdf
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/c8499de.pdf
    • https://cdn-cms.f-static.net/uploads/4421460/normal_601afc6695116.pdf
    • https://cdn-cms.f-static.net/uploads/4373776/normal_60594d6505735.pdf
    • https://static.s123-cdn-static.com/uploads/4494888/normal_5fddcd7d1596f.pdf
    • https://cdn-cms.f-static.net/uploads/4391893/normal_6046247881033.pdf
    • https://cdn-cms.f-static.net/uploads/4500883/normal_604ae8c980cc1.pdf
    • https://cdn-cms.f-static.net/uploads/4449605/normal_600adb8f7661e.pdf
    • http://bionatur.space/nora_roberts_movies_on_youtube9s45x.pdf
    • https://luvijitakum.weebly.com/uploads/1/3/4/6/134685142/nesux.pdf
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/nabuk.pdf
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5fc69148cf51b.pdf
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5fdd3294dd46c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_f455ea7828f84090907d060c9bc32a02.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_5b1d1952da9d49758ac0a1e7c6be6f22.pdf?index=true
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_bd58c1dfd80d47f7bc797511023115a5.pdf?index=true
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_2bf526e862864760b3a67751d78ff716.pdf?index=true
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_fffe0e24f6e34444a6f105f878af5ba6.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012d0e.bin
ca09ec65c2d1cf92139c82fc48de7f730b84a97cf8c09e4f179dfb8b8d025f77
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D0E 18172 bytes
font_00_sfnt_off0000f752.bin
f9ea06f95d834dcad3ff708c6cea3c078c5d03aa63e9a0889f76dfe92cd8aa55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 4980 bytes
font_01_sfnt_off0001083e.bin
34c729372b90231e6e4ec52b15fe876e98d62cf661341c3c21a32c835476a080
pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 10768 bytes