Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bc6f0e1bc8596c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 23:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 836336a9b87540e385ffd5fbce9a5b9d SHA-1: fc591b3c345ca1da33b75c206e0d6fd51c72e27f SHA-256: f2bc6f0e1bc8596cca3835c0a7ad6560e0700b71af60b2be528289e965a0d809
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to potentially disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

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 http://salonmysliwskirys.pl/userfiles/file/16763283483.pdf In PDF document text
    • http://orenprom.com/img/account/file/26661085371.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/32900266819.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/84798201862.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/33950807623.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632056575.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/51072890353.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kenavawazagogasom.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/31863700549.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/94865113731.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/bupakali.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aee046c19---kokij.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161357c567d393---xozumenix.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93992679671.pdfIn PDF document text
    • http://runhouchem.com/upload/files/vutifasurelidogazewiradi.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/tixinejoluvix.pdfIn PDF document text
    • https://limadelimon.com/images/file/jaxonuvaxinobisurapes.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/sufuteduzewoleselesudib.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/75856150951.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/59159173012.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/wusazubober.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/76210514229.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/34340350807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cube+wars+battle+survival+apkPDF link annotation
    • 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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 10536 bytes
SHA-256: b80bb114f6ee2004f2cffc54615aeb1a52dce85ad6cc93c41585b757fb1f23cc
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 18312 bytes
SHA-256: 1259e9b30fd63f7fa8eed47e2f643acff46d5ea1d7a96585a234f886b79d1b5f

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