Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db8373e1113416…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 17:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b900979c26e8061072eb50e16a3dc294 SHA-1: af26f9897202808a694123f9cb2fe96d7b054632 SHA-256: 79db8373e11134169b7b4d07cf96000166844fabe887ce3bae001c03e173c0ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs suggests an attempt to redirect the user to potentially harmful content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kidsjeodo.com/images/files/tutitepiga.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/14361038624.pdf
    • http://ketnoikienthuc.com/upload/files/55002822629.pdf
    • http://efuturesthai.com/uploads/file/56653486719.pdf
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/ninetisosopowesaze.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/70586021901.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/pabizugipuvidawilumugu.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/99856252671.pdf
    • http://area100impianti.it/userfiles/files/peseba.pdf
    • http://jingkangchem.com/upload/files/2830438687.pdf
    • https://lnpro.in/ckfinder/userfiles/files/53239145995.pdf
    • https://mehfermobilsaglik.com/userfiles/file/karokekivotisoliloroveb.pdf
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/bodanolidiv.pdf
    • http://portaldo.eu/contenuti/upload/file/65674741134.pdf
    • http://xenangheli.vn/public/files/pazupasobipolaboxopadada.pdf
    • http://studiosaletta.it/userfiles/files/pewupewikotidusanakun.pdf
    • http://refpecsbelvaros.hu/kepek/files/98372854623.pdf
    • http://naphogacomposite.com/upload/files/53080707092.pdf
    • https://myphambambi.com/webroot/img/files/66057788003.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/43236622468.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/65453ba25cb96a3801b713b412fd1e80/xagigidevebekatew.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/45274779058.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wr3d+latest+version
    • 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_off0000da05.bin
15f123babe27ef7613de1841777537d3a1c288e7ca7739dca45cabed756965c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 10472 bytes
font_01_sfnt_off0000f1f7.bin
d9572adb1de82ec3c36ec9ca0f34e58d5347c478484cfb78bc61830f3625ec45
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 17964 bytes
font_02_sfnt_off00011fe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes