Malicious PDF — malware analysis report

Static analysis result for SHA-256 a692637e51d4086c…

MALICIOUS

PDF

76.7 KB Created: 2021-03-06 01:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: fe0c9e6065d363b6afd83dc292b77bc7 SHA-1: b0aab43c6ce8b9e581405896c95a0fe4d73cf2a6 SHA-256: a692637e51d4086c49bc03e40b587d02937d75cbfc3c54334188e36cfb080c70
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document presents itself as a 'Sat practice test 6 essay sample' and contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the ML classification strongly suggest this document is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://zajinet.ru/award?keyword=sat+practice+test+6+essay+sample PDF link annotation
    • http://tijudozi.scienceontheweb.net/hp_deskjet_2546r_wifi_setup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fe2785eba14f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_6032275f78ca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60298c8a9f672.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/what_do_i_need_to_study_for_real_estate.pdfIn PDF document text
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/vuvaduvidodosa.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/8391222.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/nOpiyhf/bewugakifurenekefe.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/nikon_p520_wont_turn_on.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/hcMRjip/twitter_pobelter_girlfriend.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/7341578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fd741f0094d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fe6c6fed25c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c275ed8-f936-4e75-8875-2f655eca184b/neroxomolajozejufegiwiwem.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/live_traffic_report_m11_northbound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a788966-be63-402a-bcf5-a43b246eab22/dumarupepitutajoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/aspergillus_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/fur_elise_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9ac6dd-0fc7-4852-9775-6325b06ef21f/habitat_for_humanity_restore_volunteer_opportunities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ce0d96-cc4f-4658-8b5a-54f5ecc049b1/sirozilera.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/3947089643.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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 5436 bytes
SHA-256: aa2a973170af7632c834765c35e8d54707da5c281ec89d14aa3377eed13bf485
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10400 bytes
SHA-256: 8829a36c0a2e868c123135fc63ffa4c449565c98b9e5c1b7a4338b7ea459f10a

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