Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf2b9317668e778…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 20:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3659bbc1b8449e3ef7faf36371f7dec SHA-1: fb4ef2d404ffd8edf2b395af0d8e6ef403c1e55d SHA-256: dcf2b9317668e7784d96277926c5844e2a155d4f27c164305e3c4a90d61a36a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=tokyo+drift+full+movie+download PDF link annotation
    • http://bkmarine.net/ckfinder/userfiles/files/1631773660.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/nudize.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/joxazojubevuvifaj.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/kavekopawazifilazafora.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/84182308787.pdfIn PDF document text
    • https://proxus.nl/file/98291130880.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pizudezinimaxajekepe.pdfIn PDF document text
    • https://unaizahic.com/Files/files/33483174342.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/i6n3pp14ucbh6v28j0h2geco0d/32066619490.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/71717015845.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026ba1aec6---39288459133.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/xazasa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/nixujomanipenanax.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/31854785970.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/sosajabumonif.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/welenubabevematetibokexi.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/tusosezuvipopozosud.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/poravetopegel.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/buxezufig.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/6063041896.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/66880661483.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/68849822315.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/90663917903.pdfIn PDF document text
    • https://rafautama.com/uploads/file/94420093303.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/jadoxasiwizixugesox.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 17368 bytes
SHA-256: 57e190e7956cb2fc0fdb04e806d6dffa9829a3b1bbfe04c925fa903704fe1110
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 10768 bytes
SHA-256: 305a9fcbc76ce827b1057e5b0705d46805e8c5cd639ff262e2721065e08dfb5a

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