Malicious PDF — malware analysis report

Static analysis result for SHA-256 8964993b9ba2ab3a…

MALICIOUS

PDF

78.8 KB Created: 2021-03-30 11:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb827f96043602673d29ec952e19bb6 SHA-1: 7c10f4df53e38c314bccf58f6f39fdff08352aff SHA-256: 8964993b9ba2ab3a8c5ad0bb8199d090e180976f38bc457e62b1296757d167dd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a significant number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful websites.

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://botokaw.ru/aws?utm_term=hot+spring+portable+spa+iq+2020
    • https://static.s123-cdn-static.com/uploads/4366351/normal_5fdce49330372.pdf
    • http://vevovifox.scienceontheweb.net/51697824071.pdf
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5ff39dc40eabe.pdf
    • https://static.s123-cdn-static.com/uploads/4383929/normal_5fc6a88f92540.pdf
    • https://cdn-cms.f-static.net/uploads/4480170/normal_60198edae3a87.pdf
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5fe26aea531a9.pdf
    • http://juwupexutaval.mywebcommunity.org/adjectives_exercises_for_grade_3.pdf
    • http://bimonetejatoleb.mygamesonline.org/vewobosagakujavabazi.pdf
    • http://manidat.sportsontheweb.net/kexekowodawunojaro.pdf
    • http://puvinizozibejir.mygamesonline.org/solving_equations_practice.pdf
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5ff0b01f7a5ac.pdf
    • https://cdn-cms.f-static.net/uploads/4369651/normal_60214135c004e.pdf
    • https://cdn-cms.f-static.net/uploads/4445541/normal_605aac4111e09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c3da1a00-1df8-4b97-b634-ec92d8e8e2b6/38899032789.pdf
    • https://uploads.strikinglycdn.com/files/a6f26861-e4ac-4efe-a3a6-61b29471d27c/the_laramie_project.pdf
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_309637f41457490f8958c1de588b5eac.pdf?index=true
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_20649b0d72da4b17855b59330def24d0.pdf?index=true
    • https://s3.amazonaws.com/fulosobezur/nespresso_lattissima_pro_descaling_not_working.pdf
    • https://s3.amazonaws.com/dalava/interview_tips_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/1c59748f-60f3-4143-a100-ad0b8a271664/34113021216.pdf
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_b17da1f190fd4b2391423eb21651a171.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ab.bin
fad7e67265ea596b2d0ceda62fb6f192f8c07e023c942e5f730d2a66533391be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 5488 bytes
font_01_sfnt_off00010756.bin
cca0127c100e2f880a7d6e446f81f002157b5769dbb41c978b8288c8d6cee929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 11428 bytes

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