Malicious PDF — malware analysis report

Static analysis result for SHA-256 59729814800379f7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 08:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9c9922a01b74b871de7b9aa3ff99049 SHA-1: 194ed58df3131582c9e1dbf4b0d8d7b15dca37f5 SHA-256: 59729814800379f77970f8ae1ab70aa068b71c4c538a2c12a9fc4c36cc1ed0b6
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. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, one of which is http://rakkhunnosinghome.com/user_img/files/wafifosuxaximesap.pdf. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host malicious links.

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 http://rakkhunnursinghome.com/user_img/files/wafifosuxaximesap.pdf
    • http://studiotecnicoforace.eu/userfiles/files/nasanul.pdf
    • https://theipbuzz.com/images/file/ruzajibijawipesevo.pdf
    • http://massimosusto.eu/userfiles/files/9407250844.pdf
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/fiwifajanupulokadatakov.pdf
    • https://vantainoidia.vn/ci/userfiles/files/bakegiwufukawasax.pdf
    • https://sssmri.com/ckfinder/userfiles/files/vuforasagawojunedi.pdf
    • http://zzzwchem.com/upload/files/95251962906.pdf
    • http://unitekinfostructures.com/userfiles/file/navubetasalen.pdf
    • http://buddhavehicle.com/userfiles/file/janubudilekutalezojelijeb.pdf
    • https://villadorottya.hu/uploads/frontend/files/lamowa.pdf
    • http://alwaysshine.com/fileimage/file/sidosumogi.pdf
    • https://hoatuoi360.vn/uploads/files/99786497281.pdf
    • https://remini.hu/userfiles/file/butirijegoxovevoza.pdf
    • http://konakelektrik.com/userfiles/file/24960327634.pdf
    • https://cafesca.info/ckfinder/userfiles/files/35002806746.pdf
    • http://www.tamtrebinhminh.com/public/files/davawofofotosapalirilos.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7cc1c50c---gawozozekaguz.pdf
    • https://smilaxlabs.com/userfiles/files/mizituriponupivek.pdf
    • http://creativetechno.in/userfiles/file/31838603.pdf
    • http://ustunongel.com/image/files/fokupituvuto.pdf
    • https://carrieres-pierre.com/userfiles/file/73395034301.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614815f384e32---paxamaberumukiga.pdf
    • http://vigova.com/Images_upload/files/xedizixazukat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=thop+tv+apk+old
    • 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_off0000d58a.bin
165f98bdbb3c3f53d0edb948e8162825ad11cdac9c50591be150f487af541d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 10016 bytes
font_01_sfnt_off0000ebee.bin
d4eb1345df6573bc926d93bfaf9b0cefdc01c506d66411378c0129884e8ba51e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 17036 bytes
font_02_sfnt_off000117ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 16792 bytes

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