Malicious PDF — malware analysis report

Static analysis result for SHA-256 c909ac618325da20…

MALICIOUS

PDF

73.2 KB Created: 2020-11-23 19:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bbf47619492ffdc3b3d022feaad6230 SHA-1: 06f6bb74f5f46f962beea64dc241d072b8937329 SHA-256: c909ac618325da20bd65fde496ee85d3637f394c2045d8e1f91aeca27511d2db
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, appears to be a lure for commercial products. No scripts were extracted, but the presence of numerous external links strongly suggests the document's purpose is to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=commercial+coffee+grinder+and+brewer
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/konozevudigesu.pdf
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/2079766.pdf
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/fedutu.pdf
    • https://cdn-cms.f-static.net/uploads/4427820/normal_5fb6ca06c4f74.pdf
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/1510766.pdf
    • https://kiwusaxanasatip.weebly.com/uploads/1/3/0/7/130738973/6f83c1e935aaaa.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/lorubavevotu.pdf
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f8b252ee083d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb2224fb-fdc3-49dd-a1ec-e1b6ca94587b/43364702942.pdf
    • https://uploads.strikinglycdn.com/files/7ddc41f7-ce47-40d9-9e80-bdf5f0aa5f33/8843686655.pdf
    • https://uploads.strikinglycdn.com/files/bcd405e3-ba59-4dcd-842b-bb22cacfaeba/ragukipanilokedopinelu.pdf
    • https://uploads.strikinglycdn.com/files/76f42e25-2091-40f3-8efb-68797904cf72/nazikunuwaviguraruna.pdf
    • https://uploads.strikinglycdn.com/files/2dbb745f-be9f-48dd-a0f5-f99c8f8fef14/oster_clipper_guide_combs.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_off0000e20a.bin
54fb69ba4596ec494da1bccc220cc1cc8530aa581c8bb746c19fc87d63534750
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 5300 bytes
font_01_sfnt_off0000f402.bin
267e77bc9e819ca0c8f8ed3e13ae4c8d9f23e4d7f5c8b60c80ae321e902257f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10604 bytes