Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8661dea536aa4f…

MALICIOUS

PDF

76.6 KB Created: 2021-04-07 03:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 910a410ac04499b8d7a5fe86c6b085fc SHA-1: a97a57be43b98208550b3851adf969d354d9ebe0 SHA-256: 3f8661dea536aa4f532dfab052b1d15fea9c333379d584871fc1c5f6e1511729
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/wix?keyword=tyrone%2527s+unblocked+games+minecraft PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367302/normal_604b382420a04.pdfIn PDF document text
    • http://golijipux.iblogger.org/the_four_loves_by_cs_lewis.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/bwhaChf/vuravumonobadamowezu.pdfIn PDF document text
    • http://zemegulobeka.iblogger.org/free_app_to_add_text_to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_60393cfe81a8e.pdfIn PDF document text
    • https://cdn.sqhk.co/vijamabaf/fVhh5hf/kajuzopejutelagoner.pdfIn PDF document text
    • http://jelonit.22web.org/58608313916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499351/normal_6067e20040154.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/zrM6Ugf/palebutese.pdfIn PDF document text
    • http://bijukexamova.scienceontheweb.net/english_business_letters_download.pdfIn PDF document text
    • http://ditilage.22web.org/where_can_i_donate_a_mattress_in_calgary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5fe8b1e19d5ed.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/958511042.pdfIn PDF document text
    • http://zusozujowumid.iblogger.org/organic_chemistry_quiz_with_answers.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/buguvaserudeguwil.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/labitajaxatufib/44128476212.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/books_of_the_bible_list_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07894f08-38c9-40bb-a4e3-53cb74a54412/26412600792.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/spartan_sewing_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/31719742974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd5612c-bba3-4c24-9c22-aaf6eecbfcab/less_than_zero_movie_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/38204374566.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_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 5628 bytes
SHA-256: a9da67395496ce3d60eaf65f47ae3e18a9af62fd26de7494d4ed04a50475a23c
font_01_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10528 bytes
SHA-256: 921acbe7ca1b4b5ec5d7e705cca2cbac22d5679123d3c38a9853cc7703c47bb8

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