Malicious PDF — malware analysis report

Static analysis result for SHA-256 7924d5184ee1497e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 18:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27e4b19e37beafb0c01656e1378f1151 SHA-1: f7aaaf272423c32ae4731ab02a29efd66be561b3 SHA-256: 7924d5184ee1497eeae5010d7945f29d9e8ffa3c8ea67ba7b59855c4928d5b89
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links, with one specifically flagged as a random URL pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of linking to numerous distinct hosts, suggesting an attempt to distribute malicious content or conduct phishing. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8953022a---3960471946.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/73509153169.pdf
    • https://cantellodetersiviprofessionali.it/uploads/file/figajuxajewimalariwex.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/raruv.pdf
    • https://twr1115.net/files/fckeditor/file/36998225880.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/49580620790.pdf
    • https://rh-h1tapi-turbo.com/contents/files/22874992593.pdf
    • http://acpiindia.com/userfiles/file/48069839540.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/zebat.pdf
    • https://fallsplat.se/bildbank/file/25692483408.pdf
    • https://somos.co/dleyes/admin/fotos/file/jopemuriza.pdf
    • http://krzeptowski.pl/file/70580060450.pdf
    • http://tradotel-riviera.com/file/80429986330.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/xesop.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bupajefebanujawo.pdf
    • http://reckdance.pl/userfiles/file/kaxunatudojikukiminiz.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e628fd22919a897720ea4adb2ead5e96/sifido.pdf
    • http://whuntex.info/userfiles/file/1898913202.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/wolibirabopilusadiwepejaf.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/96295546049.pdf
    • https://rh-h1tapi-turbo.com/contents/files/gezutera.pdf
    • https://turdv.ru/SITE/files/editor/file/56603606823.pdf
    • http://matstravel.ru/userfiles/file/masenipufujewuse.pdf
    • http://simonkuehner.de/gfx/userfiles/files/12258537381.pdf
    • https://faresaldabbous.com/uploads/file/75323423349.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/levorazo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+item+giver+hack
    • 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_off0000c7f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F8 16792 bytes
font_01_sfnt_off0000e00a.bin
dfadc24acbcc01f40c65ef4429019ef63fa91bf85381e7b810e7f324c089de50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 17580 bytes
font_02_sfnt_off00010dcf.bin
6b32b5841eaee6c589b595310e831cf1c17f2e4d8560de3c7dde065933edc68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 10600 bytes

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