Malicious PDF — malware analysis report

Static analysis result for SHA-256 0076eb54268b6d64…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 02:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4249d2ac4bba6c6c41d5ccf512011cef SHA-1: 35446440d71f0053a54d3bbf53eeb1c1743b060c SHA-256: 0076eb54268b6d647da21c85d42c9a73d487e8413901b9f8db95064b9bcf16d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of numerous embedded URLs, many pointing to suspicious domains, supports this assessment. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes, and the overall structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bratislava.topenglish.sk/app/webroot/gallery/files/55864701578.pdf
    • https://bostaninsaat.com/image/files/60614162477.pdf
    • https://aczv.fr/userfiles/file/81693690323.pdf
    • http://sbairs.com/datas/files/natoronegumotawasibugiko.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/geleretoduzamolawupimoze.pdf
    • https://dgssu.com/upfolder/e/files/20210905084245.pdf
    • http://taxfreepoint.com/file/87900255488.pdf
    • http://crmloccitanecr.com/campannas/file/56340680316.pdf
    • http://hzdsbg.com/uploadfile/1631079189.pdf
    • https://senesi-sklad.cz/userfiles/file/38718227278.pdf
    • https://rajaunited.com/contents/files/mofatisudosoviwat.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0518b2b9---94631506504.pdf
    • http://evevoyance.fr/adh/.-/file/54650040649.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qljnglt1uj90j0lltq8uniktt0/5676507721.pdf
    • http://muabannhagiare.net/images/uploads/files/70604712494.pdf
    • http://dreamcatcherltd.com/userfiles/file/14632927299.pdf
    • https://artistprasanna.com/userfiles/file/wepixiwanevamulevisamivig.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/kelusupisawitezasix.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/ramina.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/94111251641.pdf
    • http://www.mediagrand.hu/data/editorfile/30289438871.pdf
    • http://thetestmag.com/userfiles/files/32218105463.pdf
    • http://hkxhjfc.ltd/uploads/files/20210916170555.pdf
    • http://dienlanhlongan.com/upload/files/juweno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rmc+call+recorder
    • 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_off0000e81a.bin
9d2dbc6950dfb3dac43729c914f5476aa4c260ae58d24f1d2dc9560f273fa3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 10112 bytes
font_01_sfnt_off0000feab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 16792 bytes
font_02_sfnt_off000116bd.bin
f674f47fe21afcb18f38db8dd926bd9032357fafdbc3f02108ce19bca53259dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 18284 bytes

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