Malicious PDF — malware analysis report

Static analysis result for SHA-256 645981eec78b6e11…

MALICIOUS

PDF

91.7 KB Created: 2021-03-27 20:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a01cce2ea8ffddb12f37f614f2e341db SHA-1: 784cd2592c57043c406f815f5f9dfc8f43c7aba8 SHA-256: 645981eec78b6e114a255240c714b32fba24b1131df722d215faca924314ff77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting it's designed to redirect users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were extracted, the structure and numerous external links point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/123?utm_term=planet+coaster+career+mode+guide PDF link annotation
    • http://vuwagumewaga.iblogger.org/can_i_use_my_old_iphone_4s_as_an_ipod.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/ib9aheq/tixejividadilofugupov.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/hbOijjc/prison_break_season_5_episode_10.pdfIn PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/3968551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461523/normal_6043e57d2bf5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_60200c6ba26c9.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/0900e253aa.pdfIn PDF document text
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/xamoxasudotalej.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/rJjezjb/lutokapilexasofesiseloze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5ffeec94558bf.pdfIn PDF document text
    • https://didiseripipake.weebly.com/uploads/1/3/4/3/134344006/6319984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_605676de86a1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/92114894975.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/jaundice_report_range.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/brother_hl-2270dw_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/brownian_motion_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/57411165565.pdfIn PDF document text
    • http://zotawof.rf.gd/1028746643.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/vonakigafexodoviwik.pdfIn PDF document text
    • http://wedutatitupaze.epizy.com/6993821013.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/48860997389.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/bedjet_3_manual.pdfIn PDF document text
    • http://dejedizanabi.epizy.com/more_scary_stories_to_tell_in_the_dark.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 5260 bytes
SHA-256: 00e4cdcc3b7bae2812650db2ad6655e47d121e8b010ddffc1ef7081c030d9ff5
font_01_sfnt_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 11288 bytes
SHA-256: 2d58e507f03dbae4caa32ced2d724bb05f11cb2b079b59a48d1c7be6704fa0b5

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