Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ed4f96cc9728db…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 11:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dde90a6572cba02b0ab91b7e21fe39e4 SHA-1: 3b37b9a1e11d43833e065f2d06813fcb08bb5317 SHA-256: 44ed4f96cc9728dbaee48ffae884c8b414e19e23b321172db3447292acd1a055
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm the malicious nature of the PDF, likely serving as a lure for phishing or malware distribution.

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://408of53crownstreet.com/assets/media/files/kepadewakumavazowuku.pdf In PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2DDAD5FF384AC41A.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109012209173314.pdfIn PDF document text
    • http://asfalon.com/__files/file/36049912305.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/79643069592.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/regadip.pdfIn PDF document text
    • http://beta-rc.com/upload/files/tuwenawesuli.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/63120793156.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210910060115.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/26531297429.pdfIn PDF document text
    • https://airxps.com/userfiles/files/gobej.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/satubuxuzadasekivujaxajo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cca65811a---13146894848.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/rajefupo.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/9526600888.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910101428.pdfIn PDF document text
    • https://longhoang.vn/upload/files/morupelibuzolabu.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901071507_4b2uni.pdfIn PDF document text
    • https://papiratisk.cz/soubory/78745535161.pdfIn PDF document text
    • http://fkhd.cz/data/img/kifapotozopot.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/32718548722.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/71590270557.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f49c1631---43022185837.pdfIn PDF document text
    • https://huanghecables.com/d/files/48559374751.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/77440047086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=main+hu+na+full+movie+watch+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 10576 bytes
SHA-256: 5125d767bd1d8a8f8da8331c62ffba1a19c52f85d7198b7ea5567c3d97340498
font_01_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 16716 bytes
SHA-256: 7e4685cf84a7640f79adc48d54306ad1e232432e8ebc3ef51cd4461264611d29
font_02_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1