Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f25b9aa4a1f0ed2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-23 05:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f8a47f05afc7c25d63236984cd668ee SHA-1: ac6c35f4f41c9a087e312edc4ce4026832baaac2 SHA-256: 2f25b9aa4a1f0ed28550cc88a6871b66cbd5f9436d14916f2177fac769d0e6b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The PDF structure and embedded content suggest it is intended to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=hopeless+game+download+play+store PDF link annotation
    • https://happen.webasl.com/userfiles/file/fotukodetujamajalazigivad.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/boroxok.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/fisetazi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/79467275866.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/nujadev.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/rabazekefujoxadomejavuwu.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dulalefugaveg.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/vujipasodimonokutadopomu.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/95161885931.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/savutixonakiret.pdfIn PDF document text
    • http://ned.ru/uploads/files/kelubodaf.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/febidefonofolebumarewujuz.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/lenabaxujubogedarajoluvu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ibqnah3rt49ekt09pl43ksqci4/66992441836.pdfIn PDF document text
    • https://t2sc.me/userfiles/kedisuloru.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/weramakexi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49637926934.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/kolijilobajulupum.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/bobotexuwuzobiz.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/gedate.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/53263686454.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/58289077197.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_off0000c5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 10832 bytes
SHA-256: 5ed3aac2b40acd712f45d99854cbe84d0ba1902831ddd00d6126db133fcae979
font_02_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 18060 bytes
SHA-256: 39bc64573a6f587a4f3acbf901675ed982a25f81e1d9fd44706e750725a9eef7

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