Malicious PDF — malware analysis report

Static analysis result for SHA-256 26761cd7b2888325…

MALICIOUS

PDF

72.5 KB Created: 2021-01-27 09:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 360b9049616cb012f6876bc73d0c13ba SHA-1: 92788050190e086b9307663c188720408bb75b41 SHA-256: 26761cd7b288832548b4df50f4c850116581a7c69b83014a4d9c85191623c9fe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body, though heavily obfuscated, contains text related to a 'gem generator' lure, reinforcing the phishing or scam nature of the document.

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://maypoin.ru/123?utm_term=gem+generator+clash+royale+no+human+verification
    • https://cdn.sqhk.co/mozulunilex/BFheSsk/66136952195.pdf
    • https://cdn-cms.f-static.net/uploads/4471455/normal_600a833d3ff7a.pdf
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/pekenobuxakalu.pdf
    • https://cdn.sqhk.co/litopozuf/D4gcjbG/download_lego_marvel_superheroes_apk_revdl.pdf
    • https://cdn.sqhk.co/ropikenetu/hgehfgc/newopamova.pdf
    • https://cdn.sqhk.co/pemejurove/jgdoBR6/mechanics_bank_online_registration.pdf
    • http://ijmalan.xyz/farm_animals_clipart_blackepm5g.pdf
    • http://reduslim-ufficialesito.site/lageranoxugl8w35.pdf
    • http://konanozopesan.22web.org/94197326864.pdf
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/2713130.pdf
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5ff8eeb0424bd.pdf
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5fde5b7b58937.pdf
    • https://cdn-cms.f-static.net/uploads/4417045/normal_600a0bd1ec665.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dd5d.bin
33ef75ac825ffcf9083262d76c0b7bb9cacd0e8143ea93d8995a45763de9c62c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 5488 bytes
font_01_sfnt_off0000eff3.bin
a47c3693563d5516f9c320b6d5334d546ba3f782336a8aedf9a8087cc72f8e30
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 10816 bytes