Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b8d9a13a887157…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 07:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3818b9e41e2b7283986fcacd01374529 SHA-1: 0b6eb25d2f87e8b69b1c67225ea627a8bbc0f8d1 SHA-256: 21b8d9a13a887157eb70e37c1eb654b7cc0cda3fd986fa5f937eedbfc037674c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including one with a 'utm_term' parameter suggesting tracking, point towards a phishing or malware distribution campaign. The PDF structure itself appears to be a link farm, designed to redirect users to various external sites.

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 https://ketchas.ru/uplcv?utm_term=free+fifa+mobile+coins+and+points+generator PDF link annotation
    • http://gyogytornasziget.hu/uploads/files/bejevogadiduga.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/20435631104.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/56739448332.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/46873926637.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/dakekidemesebepazizenuza.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/pafazob.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/fenofigin.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/newobininamemupide.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/38080247381.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/fumasupowiwuw.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/52100905259.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/5353275776.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/43413502529.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/negogodenifu.pdfIn PDF document text
    • http://zl369.net/userfiles/file/fuxotazek.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/92153423407.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/91929803958.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/zijasukovogijalaw.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/rijepumamuwanikofiwonowux.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/3480565807.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/79a963fc24a781020d97c81505a748b0/botovegujituvikuguferas.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/xibipoxituni.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/mudekekazekoxeka.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/83972582851.pdfIn PDF document text
    • 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_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 17332 bytes
SHA-256: d4dbcbccf22953f97fed89e4c0b72f692ab483bef2e9ed843a1dec5fbe648fa4
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 11080 bytes
SHA-256: d65531a0d0d29a1e89af024064a3d787240c7462b20c1cd8fdeaeebdf99d5163

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