Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2db717abb2cfcb…

MALICIOUS

PDF

81.7 KB Created: 2021-03-23 12:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 77982b07b4b504262e18b2e1d1ebd24d SHA-1: b247468584bfa3b9e1de1b130c6ad2e86caa9698 SHA-256: 3e2db717abb2cfcb4a1d33aaf26af628895cda88756bbf368ec2e718a1479cb7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a significant number pointing to disposable domains and employing UTM parameters, indicative of a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=cessna+182+manual+flaps PDF link annotation
    • http://2gusevshop.space/9207995181oy5iq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_60053c5d1c67e.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/BSic5hc/free_mac_strategy_games_download_full_version.pdfIn PDF document text
    • http://ostanni.fun/4794142881s3vdb.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/b2lijhd/36795194076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_6011e3104c3ff.pdfIn PDF document text
    • http://efarbok.xyz/sword_stabbing_sound_effectstjvss.pdfIn PDF document text
    • http://gaydating.world/888350774204qe5d.pdfIn PDF document text
    • http://stroy-level.ru/vavedexumuzozirorekubeze0ktyp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_60320076c8116.pdfIn PDF document text
    • http://epipog.com/80860676840plliq.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/0087cb78-2453-4b01-9664-5de90cacd7dc/how_to_use_a_double_flip_waffle_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff19c8a-1d75-426f-932d-ce7ddd4ac574/76187032711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0f09dd-91b3-43e5-9c9a-0f33495fd04f/4876432745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03918d44-9b09-4dff-ad15-aed149a61179/how_to_work_afterglow_xbox_one_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236f75cd-ce08-4c1b-8ca6-2d31600ee02f/95017761019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d20fd8-55cf-4cf4-ab99-ed9a6f52ab4d/67970759748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4517df0f-d59c-40c3-ad7d-ab1a66e1763e/does_nintendo_still_make_ds.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_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 5236 bytes
SHA-256: ec3faffaca316131e130de504bb9da5ff63ad7d3d36f258215fc22e5531719bd
font_01_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 11304 bytes
SHA-256: 9501b967758ed9f8614e73cc062f65bef0c05eea9077eb2613d752faebeff04a

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