Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0abd90b1f28338c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 10:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af5080fdda67451955f1d31c494ba854 SHA-1: 47c8c48ecbc0b56a49a30de6de3178af985f883e SHA-256: c0abd90b1f28338c1d765139df0ae4dbb449dc3e5963acc3fccd0d7437edc64a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting or link farms, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=class+9+science+textbook PDF link annotation
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513c982674---zavonusexujo.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/53116959374.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/datowuwuxitetasufagaso.pdfIn PDF document text
    • http://rts-3.ru/upload/files/14687769703.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/govigepasididepazerepo.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/nidowezukifasitaxoxeku.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/44843243824.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/83167350137.pdfIn PDF document text
    • https://hse.tw/upload/file/sufigufiv.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/38387536864.pdfIn PDF document text
    • https://triosms.com/userfiles/file/32940312442.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/wunivebosujitizufidirap.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/subudana.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/45308725257.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d214bf16f0---wenotoreji.pdfIn PDF document text
    • https://geniodelweb.com/file/lutirebimedon.pdfIn PDF document text
    • http://lulanjina.net/upload/files/banuvonodogefifa.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210912044639.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/85352012928.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/muzesakedakuwanopukolamu.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/padusopegomajimiga.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gusej.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD81 10656 bytes
SHA-256: 4f2d1ff717cde6ca07609eeb1e5b900f6bd5627d09a1d64b7a2df155d5c1c732
font_01_sfnt_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 15896 bytes
SHA-256: a9728ed1477df5ab2571ccb6be1a5367cb1e1ee47a1f520c54a01772048b376e
font_02_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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