Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a10eb4366dcae38…

MALICIOUS

PDF

74.4 KB Created: 2021-04-05 08:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ed9486236c98f419f8edae61a425d53 SHA-1: cdfad2db8416fc45e5d018b797f5283bb040297f SHA-256: 4a10eb4366dcae38e65147516d15ed4c93df194fcf3671cc71868a74c7309341
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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://crophysi.ru/123?utm_term=rent+lease+agreement+forms+free PDF link annotation
    • http://jilavixit.medianewsonline.com/rf_power_amplifiers_kazimierczuk.pdfIn PDF document text
    • http://joriwolujuf.sportsontheweb.net/38491069890.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/danulomeropumukiwe.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/runorewovobegiliwivi.pdfIn PDF document text
    • http://pivowave.iblogger.org/48001787801.pdfIn PDF document text
    • http://tesilav.sportsontheweb.net/68282873935.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/flannel_board_story_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_60143d1f727ef.pdfIn PDF document text
    • http://logoped-samara.ru/elsevier_s_veterinary_assisting_textbooknge2g.pdfIn PDF document text
    • http://konsalting.info/patch_notes_league_10.8g4g5f.pdfIn PDF document text
    • http://naturfresh.fun/depatogenanekedotcl8sf.pdfIn PDF document text
    • http://divuwon.iblogger.org/fitesegimokero.pdfIn PDF document text
    • http://mishabelle.ru/marantz_sr5008_preisg4m2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_601cc18fe7008.pdfIn PDF document text
    • http://proita.fun/citizen_navihawk_at_watch_band22uc1.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/05137606-b816-4118-aaca-0bc8c25aef5a/what_to_do_if_your_samsung_chromebook_wont_turn_on.pdfIn PDF document text
    • http://zejagusip.rf.gd/68701188145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089bef84-98df-4d7c-bb59-63624503e764/samsung_galaxy_s9_vs_s10_datenblatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07299011-0434-49d0-8cba-8466a020a51f/bushmaster_xm15-e2s_front_sight_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca95f589-7fe2-4283-af52-73d78dcd539b/outlander_series_paperback_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d860a508-a363-4f58-9da4-1a8c93b24c4c/bogakeperi.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_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 5092 bytes
SHA-256: 052fafee393a9c0db0b0ae5816c596a42d8de1c9954a5b27b865015fa497d84b
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 10616 bytes
SHA-256: 8d0202577ea8f364bd3fade2b5675f444a11df6511e19676fd10788df4ca8e00

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