Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dea9253f855b52…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 03:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d84b0cbce92f911689937560b536f05b SHA-1: 4f8431195cf7b796511f69cda45ec5d4eaca2aac SHA-256: b7dea9253f855b5206acff55d104b78e05a88e11cd03458b82077dc1ced8c0cf
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs point to suspicious domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=how+to+use+a+phone+for+a+webcam PDF link annotation
    • https://suativisamsungtaihanoi.net/upload/files/60502562768.pdfIn PDF document text
    • http://hasyo.net/files/file/1743319852.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/tujun.pdfIn PDF document text
    • http://pactolous.hu/upload/file/pulilapekutikojarexutaj.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/7671020144.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/44223431916.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/futixizazemeju.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/44ce67bd0f9c415ac9263ded317892dc/gevuvodem.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/1818181822.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/dujoridiwutibi.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/kivunugu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/74612860342.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/96159864026.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/83166461579.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/8840489707.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/93604112355.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/99595374042.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210909015214.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137597fbb204---12800505350.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/21218859147.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/rebeju.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210915181020468.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/wuremek.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_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 17732 bytes
SHA-256: af07c043fbd7f01b9ae4c3099aaad9d71f114b0f3f545898a908d4184786c1d9
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 10924 bytes
SHA-256: 1272892dc7282364f21d798013aa086d9ddf5d16738ac8a07085d777a0056075
font_02_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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