Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4644b90455cb542…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 19:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 233b98bef296a14b39c09e0dc0ab1f02 SHA-1: 72eba36f9dbcbfd9517eb0ea2251141d6504bbb6 SHA-256: b4644b90455cb5420802785b61aa5f6efef1e6f3fe575fc37ddd482a78538a16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://techbis.pl/files/file/pobilagutabomir.pdf In PDF document text
    • https://sharmtocairo.com/userfiles/files/51975466113.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/maworidinof.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b537bd11fa---7665057368.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/85291385354.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/kimupejolumevafujugu.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/85707950995.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/73594078900.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/masegi.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/zajimepedawopagidewiroje.pdfIn PDF document text
    • http://apsons.eu/files/file/36092594562.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/lotivowavujalanabitoj.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/55650838617.pdfIn PDF document text
    • http://farashimirooz.com/files/zisuvesagasaguredujebif.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/makutabijebafurid.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/26586817848.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/97255329221.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/40993398353.pdfIn PDF document text
    • http://gaudi.tw/upload/files/75781618860.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/47971908001.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/86035461633.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/7322702688.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/17700639092.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/maliwawojudarigu.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/12040486359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dead+ops+arcade+easter+eggPDF 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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 17852 bytes
SHA-256: ca6111140b3814b428a4c3aba0ffa29d7df8344f5e54a81a5a31ec27eaa6e293
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 10448 bytes
SHA-256: 4cd40fcad07279b332cae45958f4b3613f3dd6eeffdcc9c3e995ad1946110e60
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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