Malicious PDF — malware analysis report

Static analysis result for SHA-256 635fc938bbf50d8b…

MALICIOUS

PDF

107.6 KB Created: 2021-09-15 23:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3cd115c0f38a06cc028ee724b8feacc SHA-1: bd3c55b72cacf910bcc18004424bee7e45b33b93 SHA-256: 635fc938bbf50d8b9206d1ac66d994ea2f25680bf35fd49abcba9faa83a8343a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack vector appears to be users being tricked into opening the PDF and subsequently clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://bagodilovaspark.hu/userfiles/file/wamagitoj.pdf
    • https://ahirealty.in/admin/userfiles/files/20221920576.pdf
    • http://estatepie.com/files/userfiles/file/13696420040.pdf
    • http://joyandwowbook.com/upload/file/8725794240.pdf
    • http://learningkey.org/userfiles/30393481354.pdf
    • http://wccflooring.com/userfiles/files/xusikuj.pdf
    • http://maudchristan.nl/ckfinder/userfiles/files/lojenavebidopufef.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4251c213---48497268021.pdf
    • http://goldenteriyaki.com/uploads/files/sazaxafiku.pdf
    • https://namphuctourist.com/userfiles/file/6215431066.pdf
    • https://njshore.drinkpoint.com/uploads/files/jidaxotolajuvizeve.pdf
    • https://virker-ikke.dk/files/palezagisobobudezuniw.pdf
    • http://jgbt.us/pds/userfiles/files/sowubifumonora.pdf
    • http://hillcrestneighborhoods.com/userimages/52268337909.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/8489417903.pdf
    • https://ego-sofa.tw/uploads/files/202109111425473387.pdf
    • http://telegid.tv/userfiles/files/62781040300.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca94b2940---48082053615.pdf
    • http://krevue.cz/UserFiles/File/63579302810.pdf
    • http://technoprofile.ru/userfiles/file/80284670519.pdf
    • http://hanauhrova.cz/files/76872011691.pdf
    • http://zjleiou.com/images/upload/File/tujikeduzojefajudan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+movie+viewer+for+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126fb.bin
3307e36c5b60e3ba7d6852f047acbf77f9b05b081291ac11266ba46eef6730e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 17668 bytes
font_01_sfnt_off000154ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154AD 16792 bytes
font_02_sfnt_off00016cbe.bin
5d8b7c5ef1928e994468e98935ef18c743b0deff21d91e5edc840e5734688b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBE 17600 bytes
font_03_sfnt_off000187c8.bin
1ba0cd8ee5be1004687a9872b52dbd0d65a516e854c772a1a84ad379e678176a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187C8 10676 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.