Malicious PDF — malware analysis report

Static analysis result for SHA-256 824df3b89e5bd0be…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 01:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f98c1de080d618f75cf62203cd8b9439 SHA-1: 1a126cddcf9abf5b0461b95202eb3fd3680510f5 SHA-256: 824df3b89e5bd0be3df786ca17b160b0b76f8a1f5583256632bd1f4fced3b377
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) 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 0.9998

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://seumenha.ru/123?utm_term=website+mac+terminal PDF link annotation
    • https://cdn.sqhk.co/noviraxat/eJjcQgj/68333866910.pdfIn PDF document text
    • http://itanto.space/4811742355981ehc.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/d6hinK3/flappy_dunk_score_hack.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/the_hunger_games_catching_fire_original_motion_picture_soundtrack_deluxe_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_6041381ebf8f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_6050db3238e84.pdfIn PDF document text
    • http://tlgfree.xyz/77679800683o1mr2.pdfIn PDF document text
    • http://yachts-4-sale.com/75456735935zxrog.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/11708289711.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzomowa/h4ibidX/website_flowchart_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_602f95729da6b.pdfIn PDF document text
    • http://7lessons.fun/vehicle_inspection_checklist_excel_templateho5te.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/bulfinch_s_greek_and_roman_mythology.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/50875661062.pdfIn PDF document text
    • http://copytoshka.ru/sat_geometry_questions_and_answersseyjf.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/52361116273tabt0.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/hgw2rgc/76216431744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokutoge.rf.gd/american_english_file_5_test.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/how_to_train_for_5k_for_beginners.pdfIn PDF document text
    • http://jizokotasaz.rf.gd/kuzewowivetijixoxovev.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_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5096 bytes
SHA-256: a41e20ae135b109a61cf34a597b6743b184e3e0b1498adc23b4b306cc2671040
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 11828 bytes
SHA-256: 2087b25795af52d743c69139458f0fb5c81dff08c6a2b69c274fd6eb1fd6dac4

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