Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cbdc51955e4ec0…

MALICIOUS

PDF

88.7 KB Created: 2021-05-13 05:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 598da944485d007f4468ad1aba181016 SHA-1: 18750c29d96ad7d05d95a664b17e883e80567a8d SHA-256: 99cbdc51955e4ec0b41975ebf5e9ad8b66345ff985d8a3e20098f3fe7a20d691
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL leading to a suspicious domain. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious links within seemingly legitimate search result snippets.

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://xezojetit.ru/strik?utm_term=what+is+the+best+security+alarm+system+for+home+uk
    • https://cdn-cms.f-static.net/uploads/4403557/normal_605a7deb46338.pdf
    • https://cdn-cms.f-static.net/uploads/4392659/normal_60124fea199c2.pdf
    • https://cdn.sqhk.co/befozaxulot/eEjhj2Y/70012531381.pdf
    • https://static.s123-cdn-static.com/uploads/4479707/normal_5fc808f14b2ae.pdf
    • https://cdn.sqhk.co/samanugutu/jhjgzgu/amnesia_pc_pt_br.pdf
    • https://static.s123-cdn-static.com/uploads/4366976/normal_6001a4e9ee96d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wekibik/govinda_namalu_in_telugu_free_download.pdf
    • https://s3.amazonaws.com/muwomapotumugi/32215981254.pdf
    • https://s3.amazonaws.com/vebisop/can_you_eat_mcdonalds_sausage_on_keto.pdf
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_c41d826257a447a697cd8266eab60cda.pdf?index=true
    • https://s3.amazonaws.com/lusegokaves/79410274630.pdf
    • https://s3.amazonaws.com/xapijifas/magic_weapons_5e_homebrew.pdf
    • http://bexiponezewan.rf.gd/46505105124.pdf
    • http://dowupozor.epizy.com/app-_connect_apple_carplay_android_auto_mirrorlink.pdf
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_8b04c6e703584aad8702fc9b18549511.pdf?index=true
    • http://samepuwewar.rf.gd/carl_jung_red_book.pdf
    • https://s3.amazonaws.com/vovuzize/79023703584.pdf
    • https://s3.amazonaws.com/zumomasugipeno/kadisipiviwixeber.pdf
    • http://pevosatukiluv.rf.gd/mastoiditis_aguda.pdf
    • http://rupiroliwon.epizy.com/american_truck_simulator_mods_free.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_off00011b66.bin
841aa7aba9a5188c275dd46ef90afa0024949c016427d6ea5e64f71c74fb4457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 5440 bytes
font_01_sfnt_off00012dcd.bin
16b97d7aa0f6a9659f2df04d384085f952992097b0afabaca8d4ecf8022a1d5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 10972 bytes

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