Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfe34d30364498d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 07:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08ab3d48be9c6955416da63fe030e377 SHA-1: f3175ae840efc7687f17aa90039f3fb3a68054d5 SHA-256: 5cfe34d30364498d9cc500c831f901e2794c6f9f9ae382ec8b7f8c79c19930e1
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a network of sites, likely for malicious purposes such as SEO poisoning or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aeusjtu.pretty-match.com/upload/files/nananetejaruvigib.pdf
    • http://bakefruit.com/uploads/files/202109022327297605.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614233e3a9181---dawotowarina.pdf
    • https://newfrio.com/userfiles/files/wulexidijabixo.pdf
    • https://otoform.com/upload/ckfinder/files/nusosixugupivuluw.pdf
    • http://alwaysshine.com/fileimage/file/zimezanepe.pdf
    • http://lso-msm.fr/userfiles/file/89059629056.pdf
    • http://tokyoto.pl/UserFiles/file/11190190391.pdf
    • http://copy-office.it/userfiles/file/51819642730.pdf
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/37815427077.pdf
    • http://hvpeds.com/upload/contents/file/kapamiguvajadar.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed06de5ea4---jurunuwosetuve.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/60487073035.pdf
    • http://hp-cnc.de/uploads/files/39048709101.pdf
    • http://think6.net/ckfinder/userfiles/files/20210913224944.pdf
    • https://vanvoorst.info/uploaded/file/67218748021.pdf
    • https://jackyrouxmethode.com/userfiles/file/86763068937.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/natakilupagelevur.pdf
    • https://beruanglucu.com/contents/files/vofazowameneba.pdf
    • http://szyoujin.com/UploadFile/file/20210915182025818.pdf
    • http://budapesticukraszdak.hu/userfiles/files/77548457449.pdf
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/dibuvororalasagakewubab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sleep+as+android+native+gear+companion
    • 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_off0000db08.bin
83143a82746caf5fac2328090c64563faa28d2c9271793313469201f6f7c6da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 11000 bytes
font_01_sfnt_off0000f45b.bin
056f59c73b38267da12ee7e5530fdcd5510c70a61ec2ef1735ee96fe1cfedf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 18520 bytes
font_02_sfnt_off000124a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 16792 bytes

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