Malicious PDF — malware analysis report

Static analysis result for SHA-256 92666723cab9dc5d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 12:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 476fcf60bafe85f3045da48fa97262a0 SHA-1: ea784e412949de1de2a3406cbac34f635e519458 SHA-256: 92666723cab9dc5dc15100e490bc08f4ee9895d6bd6aa6d257b3247e9ff7ab5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=how+to+get+robux+free+easy
    • http://longruiglass.com/ckfinder/userfiles/files/20210902_110952.pdf
    • http://emailreceptionist.net/userfiles/file/nagararatelozozel.pdf
    • https://ilonew.tasksplan.com/userfiles/files/24269947547.pdf
    • http://kmbb.at/userfiles/file/76076039396.pdf
    • http://4reality.cz/userfiles/files/83604860563.pdf
    • http://tpokebar.com/uploads/files/nisopazijegiximuvinabugu.pdf
    • http://elosc.com/upFile/file///ITX202109151535414379.pdf
    • https://hoatuoi360.vn/uploads/files/masezupajijudowesuko.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/bizusikovafalijiza.pdf
    • https://cardolf.ro/files/wetuje.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8050a71c---koxemojijo.pdf
    • http://templeton.sk/userfiles/file/39064477183.pdf
    • https://408of53crownstreet.com/assets/media/files/gomewosagur.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/70649878033.pdf
    • http://ohana1bbq.com/uploads/files/66354397655.pdf
    • https://kozlovka.mebel18.com/uploads/files/ruwunotibano.pdf
    • http://rld-carbon.ru/file/kagemusirotusomi.pdf
    • https://alutat.com/data/file/67311200540.pdf
    • https://tagoproperties.com/ckfinder/userfiles/files/gedixemafivip.pdf
    • https://yensaovinastar.com/media/files/70330330103.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/14696586857.pdf
    • https://i-intelli.com/ckfinder/userfiles/files/77398741857.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/18053378583.pdf
    • http://alphanaturehk.com/userfiles/file/nevukufogufo.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b232cd405---fizezaj.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_off0000c615.bin
2727b8d1fb7f72a2427bffbe14a4815d9b7dc51581cf95a7b7ef048d36e7781a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 10680 bytes
font_01_sfnt_off0000ded5.bin
f90ad5e0d1218b6058dbddb8f40a7bdc08aeea167eed011ab762aa4c70357f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 17152 bytes
font_02_sfnt_off00010b38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 16792 bytes

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