Malicious PDF — malware analysis report

Static analysis result for SHA-256 920b2835e6af6c56…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 21:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 926602d131b914329a736948be1239e8 SHA-1: 1cb9175d9b634b5819e40d6797a21821320b6f13 SHA-256: 920b2835e6af6c56af54185d8804e4f568bff119c42ab5ff99ba6a249441a7b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting an attempt to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying a pattern of link farming on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://olapromos.com/ola/uploads/editorImagesfiles/29942122234.pdf In PDF document text
    • https://svltv.in/userfiles/files/38895645787.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/85853662829.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/5428637284.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/76296842990.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109170651086488.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/zopawafakuvu.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99077904187.pdfIn PDF document text
    • http://asustainable.com/global/file/gafuninumedigepukipexas.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/faxegowosanebodarivotisoj.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/suzipazijipejemojeropov.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea404e8ad---25188282957.pdfIn PDF document text
    • http://qdjshg.com/files/file/30882490428.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/petujuw.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/42248441877.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/64658784052.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6fdc76ede90c193546f4efefcdfdf268/pufagu.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/vipekap.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/10144332089.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/97310402963.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/detakulajixokovidawi.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/96971531694.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210908_380865C43EF5DA03.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=worst+but+funny+pick+up+linesPDF 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_off0000b144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB144 14728 bytes
SHA-256: 4e583aa580b418d1e279aa3420cdf44d79fc8709e5595759da5a9ca9e4c8e025
font_01_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 10752 bytes
SHA-256: 6da60378c28a5ff9c172adaf38cc0513a7a53eef932126d7cf302bb0f1e22c98
font_02_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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