Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c0f627d4ecb28f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 00:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a27c60d7af09c79752c8b1b5cbb008d7 SHA-1: a4696f431f9a9af15a4e0c13705917b7bd5cff46 SHA-256: e0c0f627d4ecb28f998564721156705d1f4a69eba18af222b5a49af695e707d7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external PDF files, many of which are hosted on disposable domains, indicating a link farm for SEO manipulation. The presence of a high-confidence ML classifier firing further supports its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect users to potentially malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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://bushurov.ru/images/files/94344333051.pdf
    • http://awarelaxcentrum.cz/user_files/file/nomiwezuvij.pdf
    • http://zzfcw.com/file/fkimg/file/58177868523.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/rilireni.pdf
    • http://ornito-silesia.eu/userfiles/file/gajavaw.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/biromidu.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/029026b2913da635d53bbb3f22651885/tobofojam.pdf
    • http://auburn-properties.com/userfiles/files/wadikike.pdf
    • https://ferropula.hr/files/12368977739.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/munetajugipopofuraraxo.pdf
    • http://chandigarhdatarecovery.com/files/file/47267301784.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4e09b79b01a1488227a618fc61fb73a4/37747804470.pdf
    • http://synthecinter.com/userfiles/files/67011439049.pdf
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/wimafev.pdf
    • http://kavernoklub.com/campannas/file/57694778676.pdf
    • http://studiotecnicodavico.eu/userfiles/files/30166007855.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fadub.pdf
    • https://senarathgroup.lk/assets/media/file/gipogipepe.pdf
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/1568009067.pdf
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xuloxox.pdf
    • https://kingbakerypans.com/userfiles/file/jisebuxegajuvotowemota.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+sa+android+download+aptoide
    • 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_off0000c13b.bin
a67edd238d6d3293d85cf5df0eea0188ac71e334e4e8007ecbc574452e0eb2b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC13B 17844 bytes
font_01_sfnt_off0000ede1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 16792 bytes
font_02_sfnt_off000105f8.bin
d05b174d0139008eac91d47ee0b802532cf722100a0cce535fb8a81d9249480f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 10508 bytes

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