Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3dbbd80a35d57e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 18:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d776db2c0578c55d3c790095e20b0a5 SHA-1: 506303a4c854bb236244c77c3be3ce85d2164e43 SHA-256: 4b3dbbd80a35d57e13671fb4bedc09d4aafaca8e480f9e92c773abed39a40948
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially malicious or unknown domains. While no scripts were directly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nuklearmedizin-amro.de/userfiles/file/satoduvofovatem.pdf
    • http://markone-tools.com/upload/files/29816147887.pdf
    • https://dichvumayphoto.vn/webroot/img/files/rulepafogufafobawixun.pdf
    • https://ferropula.hr/files/6807407806.pdf
    • http://rideabikenews.com/user_img/files/nunegiwagixuguvexi.pdf
    • http://elosc.com/upFile/file///ITX202109070907523040.pdf
    • https://vroa.pl/chplusfiles/file/84221166126.pdf
    • http://newo.ru/files/files/zakopuvujexuluwoginujuvux.pdf
    • http://musicandyouapp.com/webupload/editorimg/files/71438032311.pdf
    • http://npas.ru/pic/file/wozogugijat.pdf
    • http://deleersnijder-bocaege.be/images/file/70877607329.pdf
    • http://www.ciesol.com/ckfinder/userfiles/files/xariro.pdf
    • https://jewfri.kr/files/image/files/rurala.pdf
    • http://wooshin.kr/uploaded/file/20609878516131882a7f22f.pdf
    • http://sanphamhanquocymy.com/uploads/files/menokawirutufi.pdf
    • http://suvenirzp.com/uploads/files/zoburarufa.pdf
    • http://yigang-lin.com/uploads/files/202109050216201592.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5128498f---nedumedo.pdf
    • http://masan315.net/board/imagefile/file/32144069485.pdf
    • http://skkouty.cz/ckfinder/userfiles/files/50052110956.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de37cb3f9---79480348822.pdf
    • https://dichvuhappyhouse.com/upload/files/ruviz.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/lasemugejirus.pdf
    • http://ykzn8.com/upfiles/editor/files/jonibuvab.pdf
    • http://tivati.com/uploads/userfiles/file/vevefeniwasi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sport+tv+live+streaming
    • 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_off0000dfb9.bin
ed274b075a2ff8ce2856adc5427a6ef81243cec6f03560ac11760e4474faed44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 10736 bytes
font_01_sfnt_off0000f863.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16792 bytes
font_02_sfnt_off00011075.bin
e38f21e4dfe390dc9871f97884badbdc7d8b8cc145dee3ea4fd3d4f069fd1981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 17020 bytes

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