Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c15a50c4a7c06b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 22:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31f6ff676c5eda15e5650b43408a78b8 SHA-1: e6922bb64f7a18a1b60f134df48364bb515db82b SHA-256: b0c15a50c4a7c06b5e891cc7f2c5eac1f5a836ed00d247b125250251a5b141a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=android+wear+ios+compatibility
    • http://abpjse.news-read.com/upload/files/fisonapabexujupupivamata.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/82127665338.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/pezetivuwegurunu.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/38922728011.pdf
    • http://355353.ru/userfiles/file/zegoxezabiwasomuxadulifab.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5663f0aae---nabumowexogira.pdf
    • http://carsonpokebar.com/uploads/files/40306883554.pdf
    • http://aristosaigonhotel.vn/uploads/files/34762608535.pdf
    • http://hcbarrett.com/user_area/file/21150679696.pdf
    • http://boxethai38.com/upload/file/watemafo.pdf
    • https://vibangthuaphatlai.net/uploads/files/rodugomos.pdf
    • https://reazfarah.com/ckfinder/userfiles/files/jobesalogekizo.pdf
    • http://biancoacolori.it/userfiles/files/18509173927.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613913477e405---joxapedigajizebanufono.pdf
    • http://hzbmsj.com/images/upload/File/jitod.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nekifumibewakobapozoropup.pdf
    • http://saxonrt.hu/img/userfiles/files/86665703760.pdf
    • http://narcisse.sk/editor_uploads/files/45552798708.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/ralatunonojajat.pdf
    • http://sdes.in/uploads/77323111514.pdf
    • http://cleanking.net/userData/board/file/kegomezizuvokamogipur.pdf
    • http://chikatere.com/Upload/files/99258033068.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/lusavitod.pdf
    • http://vanillasky-ch.com/images/files/78196123304.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_off0000b48e.bin
1ee21b1ddfaaef062a5bdaa4d18da1ac82886aacdce6b8172e4b74093946bc4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB48E 16020 bytes
font_01_sfnt_off0000dd9f.bin
b85c65c1e33339930af1362b1528321095089e300b6fcca6cc1a1c8ed060f32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 10996 bytes
font_02_sfnt_off0000f704.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 16792 bytes

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