Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcef3427f69e18c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 05:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6eb54a066c398163e87e9479aa08b8e9 SHA-1: a6b3d3fbfc55602c810212c47afc8d92b4857446 SHA-256: 6fcef3427f69e18c99ce09e4d2601c8b3736a767652ac9e328a885b671a137a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sapsda.com/SapmaUserfiles/file/10033096423.pdf In PDF document text
    • https://projekt-lesen.de/userfiles/file/tolidufe.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/kevimowi.pdfIn PDF document text
    • http://podarox.ru/public/files/gofuwob.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa9a2d3a2---mapakoporosejikedadew.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/4775619262.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210907141101.pdfIn PDF document text
    • http://sbairs.com/datas/files/64863419311.pdfIn PDF document text
    • http://esangsok.com/upfile/files/padewoladuwunima.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/95257751488.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/nenobaraxanowakotew.pdfIn PDF document text
    • https://basisnomor.com/contents/files/zigewikajujaxirovi.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/gefejorifosenobowul.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/delopubuxujevikivavozibu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26a7d5b04---tebuzopebabok.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/36813958399.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/29764041464.pdfIn PDF document text
    • http://superazs.ru/images/news/file/fefofobopikapiw.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/lizofapowadineriduben.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/fewurigerosujerag.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/dujomazen.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/59217333797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=internet+calling+androidPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210917/16318350857581.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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 10328 bytes
SHA-256: 509e3f9b998fb4b58ab993dd52fa7954e7677cedd494676a13233c4847297018
font_02_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 17996 bytes
SHA-256: 32295a8e98f2669e5e2428876d1f21fa244656cecef0a3880d8f094b94a4e262

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