Malicious PDF — malware analysis report

Static analysis result for SHA-256 08228966085c1821…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 11:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca2010f0af01a2f3cece8df2bb2448b9 SHA-1: 03271e302ccf6208a7df829c12a92cb9a59a839c SHA-256: 08228966085c182179a18c3ac6c20eef2bd8bacd384fc90425821a919c1179d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=free+android+spy+app+remote+installation
    • http://studiotecnicolari.it/userfiles/files/97925684957.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/wewuzawitepijijonafufim.pdf
    • http://ubest.ru/images/file/bagubosenetulix.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/34769417333.pdf
    • http://francescofesta.it/userfiles/files/27197318245.pdf
    • http://horvathortho.hu/tmp/28230838164.pdf
    • http://hanstime.com/userData/board/file/29668424515.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/juxipik.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/21202325775.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392453a6818---fukogowutoratumo.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/69378426450.pdf
    • http://iehyun.com/editorupload/file/28709621267.pdf
    • http://nanumed.ro/uploads/files/nunamorejofazavafubovulat.pdf
    • http://fixafilm.se/userfiles/file/fatorobururamavotide.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/roxipiz.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c55f005ea50b7dec94f8d81597595969/wejirulu.pdf
    • http://luberoff.com/userfiles/file/18709931016.pdf
    • https://southafricapools.com/contents/files/15962736280.pdf
    • http://qianxi.cn/filespath/files/20210904043528.pdf
    • http://auksozvynas.lt/userfiles/file/sumejejejuzakefososer.pdf
    • http://yourtruck.be/upload/ckeditor/file/xudowadexodumad.pdf
    • http://cukiernia.eu/upload/files/migujovixunidedenavavelut.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_off0000e27d.bin
4f179f634ce7808c11a1bf7e79d21611cc5c189dbcc00ceebffb465e65d5c2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 18672 bytes
font_01_sfnt_off0001135e.bin
db7f9ab1f7085c517fd534174dca510bd2a781b7b53f82e26be273f4958f86bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 10644 bytes
font_02_sfnt_off00012bb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 16792 bytes

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