Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23c89105e92f757…

MALICIOUS

PDF

73.0 KB Created: 2021-03-08 16:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 234884686924d170260a424e12b36e6a SHA-1: 2ffe354726b5f8f543c8bdc6eb14dab17b73be59 SHA-256: c23c89105e92f75700372d6cc90a8ddfa671d6b5072b273d2dfbe4c3716179b6
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as a malicious redirector and link farm. It contains numerous embedded URLs pointing to disposable hosting and known malicious redirector infrastructure, suggesting an attempt to lure users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/123?utm_term=oster+bread+machine+manual+5838 In PDF document text
    • http://mail-autoscout24.net/792917872384ggwl.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/40484567648.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/xefisotukozonevikiv.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/126477.pdfIn PDF document text
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/jawivig.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/1rCgfii/best_rummikub_online_game.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/1874298.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/chfihhy/tudefafotalusuriloxunev.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/how_to_set_adt_time.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/juxavago.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/ijuihja/bomber_friends_202_level.pdfIn PDF document text
    • http://fitokaps.xyz/the_road_not_taken_figurative_language_examples5m9gs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_bfec7041725148b7afcbaaff2c9f615c.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_739f3ad9a53449359e2964906272053b.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_72b0206ecab646c9b08f74cad8a67f63.pdf?index=trueIn 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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 5828 bytes
SHA-256: ff2c57cf63933c6d402ab0822dbb4ff5818127bf8eebdbcec64901ff3a2cc464
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10476 bytes
SHA-256: d02efb872ffc16cba966c85aba705142e206a4eb0c733d63ae27b1b78b1d153b

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