Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33609ae3452df48…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 14:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95c72db26a70bb4ba63a9ce8cb7b4178 SHA-1: 35e745d9bd60eb05dee402a1a7713d69969920a5 SHA-256: f33609ae3452df486bfcd7415401dcdb2ce94dd4c9ffaf2d16925cb4f572be6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links pointing to various domains, many of which are likely disposable, suggesting a phishing or link-farming scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the overall structure and heuristics point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bibliotheque-des-arts.ch/ckfinder/userfiles/files/retow.pdf In PDF document text
    • http://hoteldanang.com/uploads/images/files/rovigadexap.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/94409744614.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/tizajekalizazoduxapu.pdfIn PDF document text
    • http://npas.ru/pic/file/74779881505.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da349e3f46---dakerewakolujikusuw.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/mapabakafe.pdfIn PDF document text
    • http://vodnik48.ru/content/file/68577883550.pdfIn PDF document text
    • https://resicolor.com/upload/files/depevid.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/kaxubasunifu.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/21441981444.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/32507857661.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/golakuvafulovetig.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109041447155966.pdfIn PDF document text
    • https://architektor.ru/uploads/file/69290781556.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/pazudijomizukozezowax.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/somosadazufugexepuwagowa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ad3dde14---89416970879.pdfIn PDF document text
    • https://sd-olimp.hr/files/sefaxuxuxuxusafobavi.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/22146367362.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/4147407892.pdfIn PDF document text
    • https://limsurdua.com/contents/files/94829605593.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/wixovesobin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+ruby+emulator+unblockedPDF 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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 10716 bytes
SHA-256: 812a2c4fa277a86d011f72c095a6b99c4d65bc9b67ddea7d2e969924eb3f2bdf
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 18952 bytes
SHA-256: 182315a21729504ec7e114195996089cbd336bdadfb5d024fb1896f2e58865a1
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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