Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c0a9c2958ca488…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 11:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6c5bebe458d2f9f9d6e4cb9df238cd5 SHA-1: bc69b2910ac6da1da2f93f0765f13f13827780f3 SHA-256: e0c0a9c2958ca488a446bb3d5c663838bcdadc2acbd28797c7ad1da571a48ef5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=road+fighter+apk
    • http://eluvial.com/sites/all/sites/eluvial.com/files/22097164072.pdf
    • http://nemochem.cn/upload/files/xabujizekuzobulugegoz.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/29439406868.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/20887789748.pdf
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/1680238924.pdf
    • https://alsharqcc.com/userfiles/files/68389812678.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137463df0847---xaxufigifurinonatup.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/65744720288.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/sewaveseledizitobo.pdf
    • http://inistor.com/ufiles/files/76145178142.pdf
    • http://problemconsulting.com/img/download/files/zorebutobi.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/vasid.pdf
    • http://amandatravel.com/userfiles/file/toxogejuku.pdf
    • http://jadeite.ru/images/file/87519944098.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9b7e4d82---xosezozokamewe.pdf
    • http://erainbowrealty.com/userfiles/file/66061385498.pdf
    • http://kaithompson.com/userfiles/file/jaguwuk.pdf
    • http://qiuyutv.com/userfiles/files/20210907083140.pdf
    • http://toszegisuli.hu/userfiles/file/givuke.pdf
    • http://hyunsin.net/userfiles/file/doganadibo.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/60623507421.pdf
    • https://marcuspietrek.de/MARCUS/files/file/bigoreve.pdf
    • https://ietc-oman.saktoon.com/userfiles/files/25472526944.pdf
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/jopisoga.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_off0000c403.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 16792 bytes
font_01_sfnt_off0000dc1a.bin
2507a0da76f17b0ff1826ec644055308f30fd20c0e93cc7ccfefea5a9d186fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 10596 bytes
font_02_sfnt_off0000f438.bin
e8f2d0dcf82816de5e56b5a871c6c870f805046b22c1aad6b146b81b2b700945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 20772 bytes

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