Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ce31e4bd32f1bc…

MALICIOUS

PDF

75.3 KB Created: 2021-03-22 15:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6354cba5109ad4f3419c31ad2f964726 SHA-1: 1f38f92245235b7ec55df83f12862ff9068ede75 SHA-256: 64ce31e4bd32f1bcdca2ba36bec115c598f101a759a77db861bafe1489e11e78
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/strik?utm_term=why+zero+zero+zero PDF link annotation
    • http://rojibitakuvekuw.scienceontheweb.net/how_to_use_chefs_choice_knife_sharpener_4643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_602057f2024a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_5ffd62906f0fc.pdfIn PDF document text
    • http://vawubarisef.22web.org/4491027169.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/how_many_calories_in_wendys_frosty.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/gatenesodajij-kivapopepuzujis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_6054df0eee4c1.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/jewegekarunanazovafewi.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/lspdfr_callouts_plugin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_600bc4d36acc6.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/641050c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_6046d483bf886.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/bahubali_2_movie_hd_video_song.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/redegelesibif/13314617483.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/99014385127.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/loleba.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/ditesasezuvipopozi.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/microsoft_sql_server_express_2008.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/cutting_activities_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/tent_card_template_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/time_clock_worksheets_for_first_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/codechef_september_long_challenge_answers.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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 4520 bytes
SHA-256: 3bb5d76818c0fab0bffa2fcc1181e7ed6bb52e76b3cfbb4bf31110bc4707f090
font_01_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 11096 bytes
SHA-256: 12cd28413753d976ebc211773d74216abd046753a4b7f376c64b94960d7370f9

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