Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7aaf3967ef5943…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 08:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef7604382e2274efe1b7b388a95a51de SHA-1: 17c478334dd693015a92d17c2cb88b77f3b3a162 SHA-256: 4e7aaf3967ef594328b2e840109fa98c67d09143a0af4de35647a9fe71e4d76c
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. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document's primary purpose is 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 https://pixomot.ru/uplcv?utm_term=mortal+kombat+1+for+android PDF link annotation
    • http://fullx.net/files/81820048845.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/53678261003.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/37538105893.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/digojugavojimenelej.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/sazedosoxexufivik.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/gikaxonagolejidaweta.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021932123438283.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/1208607413.pdfIn PDF document text
    • http://yuhongzg.com/d/files/43207049102.pdfIn PDF document text
    • https://hobbypet.cz/files/file/51230895195.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b54a66391---37083247722.pdfIn PDF document text
    • http://synhbio.com/upload/files/nomivizixuvejewawakofiji.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109150730438884.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/34487998328.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210905115858.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/15550554212.pdfIn PDF document text
    • http://partnercable.com/files/bojadalexonumefegaxiguw.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/29347540434.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2f6dc0e0f---wijakebubo.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/semusix.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/gijoxuresejugobugarem.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/fotiwitokikoxire.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/19259240784.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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 18340 bytes
SHA-256: a2bd455da0d6dd1d27a0447c2553a523b8afc31c2028aa826cc1979f4a1aa601
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 10492 bytes
SHA-256: 14531bded88c159b41e934df92fd6e3261ce98be1a2ed19e2a1c6621423a9bc2

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