Malicious PDF — malware analysis report

Static analysis result for SHA-256 2726d6bd6940fee7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 04:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42db5b03ded78eedbebaaeed2afd4bd9 SHA-1: ea5e83c6958e776f74f749bed1ee43ddc0b9aad3 SHA-256: 2726d6bd6940fee75dc329f08926fda03d6273b09d2eaeae0fc91f81b9752cc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is for malicious purposes, likely to distribute malware or phish for credentials. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards a malicious intent, possibly involving embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://catamma.ru/uplcv?utm_term=suicide+squad+movie+dual+audio+download
    • https://dnm.tw/uploads/files/202109040728016798.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/78430006118.pdf
    • https://partnermind.cz/images/files/gavizunixadukigazodoj.pdf
    • http://china-zub.ru/userfiles/file/48041740219.pdf
    • https://tomorrowhubs.com/upload/users/files/5539107137.pdf
    • https://0955205219.jwa.tw/userfiles/files/40710506229.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/46352048412.pdf
    • http://china-zub.ru/userfiles/file/46883463466.pdf
    • http://www.ap-arte.ro/fckupload/file/fumelixusadiril.pdf
    • http://dtjxbpzx.com/filespath/files/20210901170615.pdf
    • http://studioagm.it/userfiles/files/7690941390.pdf
    • http://eiak.org/upload/editor/files/92390925085.pdf
    • http://wittymall.com/multimedia/userfiles/file/76746369056.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d51ec76d---kanuxarepixobomom.pdf
    • http://freeware-software-download.de/uploads/editor/file/80317149176.pdf
    • http://artc-polymers.com/upload/images/files/gomit.pdf
    • https://peoplehelppeople.net/uploads/File/nekunojobanofunobemuv.pdf
    • http://lavalnerina.com/userfiles/file/nilerabefupaxe.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137781aebffa---fazatawejesinadobosubiwo.pdf
    • https://dom4m.de/userfiles/files/nogogorufetulotirog.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/womixotexogemugifurod.pdf
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/7079531764.pdf
    • https://baruipur.org/ckfinder/userfiles/files/fudoxunakotozanosi.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/78208052330.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/mivipinaj.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/69396092115.pdf
    • https://harmony-lazienka.pl/Upload/file/10805282311.pdf
    • 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_off0000e367.bin
5434ccab7d8597720f8bbacaf93e44ebd603a556b55aacacfc4dfab14163b65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 10804 bytes
font_01_sfnt_off0000fc19.bin
9d72fad0982b3b69cf66a0692bba08d6289099607a2d1e34d6e5b0e7552216ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 19032 bytes
font_02_sfnt_off00012d53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 16792 bytes

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