Malicious PDF — malware analysis report

Static analysis result for SHA-256 304d491030f21bea…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 09:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2525a4071092135aeb8d8dd9091cf67f SHA-1: 79aba9c888e0a06b5b64b3f5fd4e4bbb77706baa SHA-256: 304d491030f21bea25a226dcbc412dfc52b8a966e4c262b2a160398e25228daf
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. It contains numerous embedded URLs, many of which point to PDF files hosted on various websites, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure the true malicious intent by distributing links across multiple disposable domains. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161409501cfb3b---tosigutuburidumugaraluwob.pdf
    • http://blackhorsesc.pl/userfiles/file/wapebevi.pdf
    • http://twozonechickenlasvegas.com/uploads/files/wofijolalapeje.pdf
    • http://classtool.info/upload/files/39535073102.pdf
    • http://braciszewska-klimek.pl/fck_files/file/65405145532.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/ximelo.pdf
    • https://linardi.ru/files/file/69082289360.pdf
    • http://olgapolyakova.de/files/files/47320350356.pdf
    • https://mamap.in/ci/userfiles/files/tuxevubixadi.pdf
    • http://cutyoursupport.com/userfiles/file/44414979320.pdf
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/61134373324.pdf
    • http://client.diffuse.info/files/zusipi.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa10d934a---24713331413.pdf
    • http://pjteam.hu/uploads/xivoneb.pdf
    • http://letresorellebio.it/userfiles/files/6189403839.pdf
    • http://ippinnudon.com/uploads/files/42941877479.pdf
    • http://truhlarstvisollner.cz/data/file/tukiwobifotafojaza.pdf
    • http://dawahcity.com/userfiles/file/losizemesopoxu.pdf
    • http://honeystraw.com/uploadfiles/file/kazageziwosazalilu.pdf
    • http://orem.mn/uploads/files/32737892027.pdf
    • http://fernandopelosini.it/userfiles/files/zozawojovixenozagidorepa.pdf
    • http://freestyler.cz/img/file/jegawovimitaxuk.pdf
    • https://meganimal.pt/site/upload/file/62776906441.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+live+net+tv+4.7+apk
    • 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_off0000d5ff.bin
749ecbdb6a93453ee7462f5ce1763cf45af6910c41fc386a869e43f68daa704e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 17864 bytes
font_01_sfnt_off0001040d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16792 bytes
font_02_sfnt_off00011c24.bin
9a7f6bcdbc4ca066835c9008cfd43c045d95f863e5c899d5a218306e19d0bd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 10556 bytes

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