Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff7e09fcd959eb9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 05:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b636d66588f8c7ac5455b76114c17f98 SHA-1: 6959ec67636696eebf0d7d6a95064968f08789cd SHA-256: bff7e09fcd959eb9d62898135aa60a7605c5da735a7d1f13f604c468cd23ef5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://devison-matras.com/upload/file/15793983613.pdf In PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/17394642013.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/rakaxajulapuzaw.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/72467838391.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wuxuxuseritezotako.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/tefaxiri.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/kivivujewatadi.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/pajimofedizivebezigoxo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161359b5737ab3---18095505526.pdfIn PDF document text
    • http://ibb-online.ru/f/file/80998183535.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/mivadakodi.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/36631148628.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340fe8a8266---goxubisiletukawir.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/22708442494.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/31591234813.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/remelometogututibujij.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gevidizodusixodubiweluru.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/supigo.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/92259710238.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/roxoxipevo.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109021513594384.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/suzexasepalore.pdfIn PDF document text
    • http://budropol.de/Upload/file/kezedowefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+clay+soldiers+mod+1.7+10+downloadPDF 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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 17588 bytes
SHA-256: 0220b36af04fcc3390dc1aba72bd763d62c2dce16aaff4f6f08865a0b0840829
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 11120 bytes
SHA-256: 1eae0089a2dd249545b97ba666229d6620b6d34639fd6fef414018da8dd5c59c
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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