Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9c0d9190381f18…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 04:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38cfe15b66a0ea6160e3b0a4d4ac59aa SHA-1: 1fcb472ea69dc5636769589f0e46b64441c9070a SHA-256: 0b9c0d9190381f1814b32761e030e3ea2adfbc8361e0c1dd262eaddf262c6206
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=filmora+pro+apk+latest+version PDF link annotation
    • http://architettomontanino.eu/userfiles/files/22164196399.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/winujafizijalerumajebidaf.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/bexerenajimofeluzurenob.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/98661569047.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/kiperunenax.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/18411159819.pdfIn PDF document text
    • https://sambelteri.com/contents/files/8189813285.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210911012605_pxk27e.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/tadaxer.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/jobinozagoda.pdfIn PDF document text
    • http://cloverdiamond.com/file/zilamikuzewadunigo.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/bojovetuz.pdfIn PDF document text
    • https://designclarf.it/file/21101659769.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/pomagil.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/78144431763.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/21580322105.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/50781296426.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/21588468291.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/14639138273.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/gisedisuponogefiziwogire.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/92147624229.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210914/file/16315994271215.pdfIn PDF document text
    • https://dom-titan.rs/files/gibafajifixubi.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_off0000b352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 17588 bytes
SHA-256: 76c28deb65c7f4e40ecb87accb4bf0d53095a42d44b9add6f26961a034b33b39
font_02_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 10548 bytes
SHA-256: 22d84936fe76c19b23f5d5cc34361e317361b369b26626afbf5de8713d169586

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