Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d8d4d71a280af1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 08:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 546f4b6029a8d44102144f5ad23229d6 SHA-1: e7a9b71807fab6b46f9a8aee0be700f404db178a SHA-256: 28d8d4d71a280af19150a634b30283dd32fd67b425d77bc0ec7a1130fc830c92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the final destination and potentially distribute malware or phish credentials.

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 https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/45952377659.pdf
    • http://hebakotb.net/userfiles/file/59976830146.pdf
    • http://jamalcar.com/userfiles/file/54027514442.pdf
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/dolipibiw.pdf
    • http://retailcop.ca/files/monuxevemebiwafagikedosu.pdf
    • http://tuning-zone.eu/userfiles/file/58783789013.pdf
    • https://rajakedua.com/contents/files/25511532090.pdf
    • https://fond.ru/userfiles/file/26304969229.pdf
    • http://weingut-suppan.at/files/topuzosemevoranorivamati.pdf
    • http://discus-rus.ru/upl/file/molajaxemojaxadigodimolu.pdf
    • https://ktmcollege.org/public_html/userfiles/file/21528959413.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc1c5f810---99812243009.pdf
    • http://pileshoppen.dk/userfiles/file/62557584961.pdf
    • http://nelly-design.ru/upload/files/96696393223.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47353100910.pdf
    • https://supermovi.com/userfiles/files/jarome.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/segamafusenopologase.pdf
    • http://kovacsoltvaskerites.hu/images/file/mapifixilol.pdf
    • http://mofrantech.com/userfiles/file/tulideret.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909175504270218.pdf
    • http://ossokahve.com/upload/file/waxegomufonejagebiwome.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4262df256b6d1c43a5a0b06189573bde/53776053861.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wps+wpa+tester+android+10+download
    • 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_off0000d83b.bin
7bf9015bd737290ef69b02164ae1a94bea46e65002ae84d1daf22b73ba9d4da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 17100 bytes
font_01_sfnt_off0001046f.bin
1fd57a4cd71ec886bde4817f27698f35e3700e4fb7e4ff2fbc461c85bc86102f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10636 bytes
font_02_sfnt_off00011cfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16792 bytes

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