Malicious PDF — malware analysis report

Static analysis result for SHA-256 140bd4d03d1a1464…

MALICIOUS

PDF

81.1 KB Created: 2021-10-10 08:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d59789f523dea47a634b3c08804a73d6 SHA-1: 5e18d5586df0dbef9f8e2e8f6d14c4abe8f5824d SHA-256: 140bd4d03d1a1464a64d52699e239a313bcda47b58468e87b079a41f9342e2ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing/trojan PDF indicates an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://citronixdeflection.com/nbloom/fckuploads/file/21128066083.pdf
    • http://www.medic-pneumolog.ro/fisiere/file/3389202261.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/gefuko.pdf
    • https://reparationmobile.net/userfiles/file/jatumepolelutupewez.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/78509863869.pdf
    • http://artvideo74.ru/upfiles/files/nidigijitivojejapitugu.pdf
    • http://lulanjina.net/upload/files/gabexuten.pdf
    • http://daivupaint.com/img-chamthi/files/79996977583.pdf
    • http://sjccgy.com/userfiles/file/kelujij.pdf
    • http://kowalstwwo.pl/public/cms/images/file/xupodozaxufa.pdf
    • http://sharon-barron.com/userfiles/files/pafalofazug.pdf
    • https://truongthanhco.vn/webroot/img/files/41116408142.pdf
    • http://naturalfurnish.com/userfiles/file/97992802051.pdf
    • https://spandoekland.nl/userfiles/file/tonenadegupapusomug.pdf
    • http://mtsskzy.com/userfiles/file/59209239751.pdf
    • http://labotinnghia.com/img/files/67747538006.pdf
    • http://printific.com/images/contentimages/files/68406483915.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/simuw.pdf
    • https://foodsafebox.com/ckfinder/userfiles/files/mokivuxiretopodadatut.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/56452402718.pdf
    • https://wilde-signs.com/media/sejaguduvavobusasenodemu.pdf
    • https://saunadlaciebie.pl/userfiles/file/xanixamutefof.pdf
    • http://shrlie.com/upload_fck/file/2021-10-2/20211002000500238508.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=after+school+counselor+resume
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 16792 bytes
font_01_sfnt_off0000f364.bin
02c8e1681a88392386896ba29839ac89da8364541e9e6e1848bcad821a139bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 10428 bytes
font_02_sfnt_off00010ae4.bin
c3719f49aff791c7d30d9569b5199b7adfa5e0cfa371dda8a794cd433846ca47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 17448 bytes

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