Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1cb56f2d7cef2b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 05:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 956945ed944236d99d300ca208139c69 SHA-1: 9a14f97fdc144f53d2bac346d509918f1d2d6c11 SHA-256: 2d1cb56f2d7cef2bce46dc8ba981631a2acf430f5da678b2f4d932a86f6be2ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting a tactic to obscure the true destination or distribute malware through a chain of redirects. The presence of many unknown reputation URLs reinforces the suspicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sotel-perm.ru/site/file/pejolu.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/98746548562.pdf
    • http://jyjwqj.com/uploadfile/file///2021090506440671.pdf
    • http://omonetach.pl/foto/ilustracje/file/67237491164.pdf
    • http://christschoolblr.in/userfiles/file/1426426720.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/1411033381.pdf
    • https://masukpt2.com/contents/files/19461504327.pdf
    • http://flexa.cz/docs/file/4980031350.pdf
    • http://thietkewebbacninh.com/webroot/img/files/pimum.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137a91140750---solekizomomumugiga.pdf
    • https://paroles-vives.com/ckfinder/userfiles/files/konopuxatobapolitaxavuz.pdf
    • https://webmenuplus.com/images/file/luwuragob.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/bumidoditapefazamo.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/vazexiliginejodo.pdf
    • http://lakesnwoodskerala.com/uploads/file/28753093867.pdf
    • http://laihoawedding.com/app/webroot/upload/files/pisapugabakefev.pdf
    • https://dpengineers.info/admin/userfiles/file/wodomirukogepojevetize.pdf
    • https://samsungklima.net/upload/ckfinder/files/21100485809.pdf
    • http://banglenhospital.com/UserFiles/File/rumasiri.pdf
    • http://elma-itc.ru/!upload/files/tovala.pdf
    • https://www.nitdgp.ac.in/uploads/userfiles/files/zajinilofafu.pdf
    • http://daiichibus.vn/uploads/news_file/9927273056.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89599c087---97188058480.pdf
    • http://onlinevay.com/upload/files/63899625748.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+round+icon+generator
    • 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_off0000d375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
font_01_sfnt_off0000eb87.bin
3c82e235ec02178c889a6dd5d5f032c36386d8c88889aa3f5965ef34cdb9fe2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 18288 bytes
font_02_sfnt_off00011ac6.bin
740d62a850fdcd27815a01b1b3dd63c0e78bc3942c41633a5a50cb9405bc346d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10412 bytes

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