Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf505b9b59638808…

MALICIOUS

PDF

118.7 KB Created: 2021-03-15 16:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8423807e4e62df9d5b30e67c08501485 SHA-1: db4072216ee3751bd697c6cbd3726c4b18e6bd8e SHA-256: cf505b9b596388085c56c580191b84d34fd9057af84cde8dcc3eae62c2199a1b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic highlighting the suspicious link structure. The embedded URLs are likely used to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pelibifir.ru/strik?utm_term=toro+20017+belt+replacement
    • https://cdn-cms.f-static.net/uploads/4393363/normal_6024edfc068c1.pdf
    • https://cdn.sqhk.co/mujexoxa/sAhfihB/metroid_prime_trilogy_emulator_controls.pdf
    • http://mimivamefigupe.sportsontheweb.net/miwotapevujotujifig.pdf
    • https://cdn-cms.f-static.net/uploads/4482671/normal_601adb4760441.pdf
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/datowel.pdf
    • https://boluzevorekov.weebly.com/uploads/1/3/1/3/131384542/4b1b356660e.pdf
    • http://tupakewufitid.iblogger.org/48713691384.pdf
    • https://cdn.sqhk.co/siloneza/gighRif/billie_eilish_images_smiling.pdf
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/dulegulujoxasufukase.pdf
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5fffc3a3ebc46.pdf
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/f54ff2a80bd.pdf
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/mijoleluf.pdf
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/4263210.pdf
    • http://fesotisifofil.mygamesonline.org/bugumaxixubipaga.pdf
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/7718851.pdf
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/7fa5b9d9.pdf
    • https://static.s123-cdn-static.com/uploads/4418557/normal_5fdf2cc0e1ffd.pdf
    • https://retagavit.weebly.com/uploads/1/3/4/3/134363188/82ee03a5af6de7.pdf
    • https://cdn-cms.f-static.net/uploads/4451760/normal_6041a72f736a7.pdf
    • http://dozixolabizije.iblogger.org/21773764079.pdf
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/dofarozovizezo-seruxinaruri.pdf
    • http://zoguponuwuxoli.medianewsonline.com/42388680564.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rodexiguv.onlinewebshop.net/17638994841.pdf
    • http://forojiwimudobo.atwebpages.com/26115368535.pdf
    • http://juludix.epizy.com/76166487911.pdf
    • http://dorofudi.epizy.com/cuttlefish_facts_and_information.pdf
    • http://raxusitusumulag.rf.gd/xufokawo.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_off00019391.bin
26c450b870d4131b46cd9a38b8cb14758e70ee9e609eea63f04a61243d92537d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19391 5396 bytes
font_01_sfnt_off0001a5d7.bin
df659e5a979029ff5ec3774827a895973cad6818346d920a494e31df89d00f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D7 11052 bytes

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