Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcca85dddb17c56…

MALICIOUS

PDF

92.7 KB Created: 2021-09-17 00:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25899ebba5c513b4fb0615664eab62c5 SHA-1: ae2ef031bcf71f0cb11c3d520a0f963593a16827 SHA-256: 0dcca85dddb17c56f10a8a8263a274dd2c185aa0b65006fa3d137cfcb855a844
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ClamAV signature and an ML classifier, and it exhibits characteristics of an advance-fee scam. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into downloading further payloads or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://imobiliariaimperio.com/files/files/wagifu.pdf
    • https://aymfly.com/aym_image/files/2236787540.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b1fab82efb324dd3675b2915d4d83718/78718219980.pdf
    • https://susta.vn/userfiles/file/tapufegivatikovex.pdf
    • http://zensushidanapoint.com/uploads/files/29326692139.pdf
    • https://adci.vn/data/upload/file/kigoposobixok.pdf
    • https://proxus.nl/file/37106619569.pdf
    • https://panificioilcavaliere.it/userfiles/files/warononaxen.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/vakuwajugixarakutufapu.pdf
    • http://annamsaigonlaw.com/upload/files/lodomisako.pdf
    • http://lumieye.com/userData/ebizro_board/file/41298212881.pdf
    • http://cyuanmei.com/userfiles/file/94940756555.pdf
    • http://svenskafik.se/uploads/fckeditor/file/zebubetux.pdf
    • http://thunderstar.cn/userfiles/file/20210906195757954155821.pdf
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/78078964678.pdf
    • http://hanasushimenifee.com/uploads/files/34607639807.pdf
    • http://bogaarchitetti.it/userfiles/files/53130185680.pdf
    • http://kaies.cn/upfiles/file/73700483338.pdf
    • http://csim.jp/ckeditor/uploads/files/85316230845.pdf
    • https://cfbadalona.net/ckdata/files/59860030936.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2df5b2b38a1ad70b04d93093322f91d0/66904829978.pdf
    • http://2rent.gr/userfiles/file/lonedififif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=1e+player%27s+handbook+pdf
    • 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_off000101ce.bin
219c25d6b6facdf46518e9f4943cd30b31c0eae51ab26db4e1486ed0f51d01e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 19392 bytes
font_01_sfnt_off000134ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134EC 16792 bytes
font_02_sfnt_off00014d03.bin
165ba2d792b484b2cbab7da3abd74318b7e039fcbab1cfcca162c0f614ffdd5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D03 10740 bytes

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