Malicious PDF — malware analysis report

Static analysis result for SHA-256 06423396e08b51f9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 04:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 4220ce0f5204494e6138c3c439c87d06 SHA-1: 2ceba2d144b882ea2a8c51959563a03b52da19c7 SHA-256: 06423396e08b51f93f8f9f7e28d5a3827b879852bd56d3f3d5cc2db82dcfae0a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://jagdrevier.hu/upload/images/file/dibifipamovivuxag.pdf In PDF document text
    • https://valergences.fr/userfiles/file/davojikefibepigovexumejud.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/vudonupupevi.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/xekuzenu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/dogela.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/41687783301.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vobokil.pdfIn PDF document text
    • http://farashimirooz.com/files/6310621084.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/64712258690.pdfIn PDF document text
    • http://atrsara.ir/resource/files/junowufexaw.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/11166001343.pdfIn PDF document text
    • https://dafelia.com/files/migatebinove.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/30654635177.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/10461446895.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/lubakem.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16153012650.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/82697812377.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/38038583074.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/dafuj.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/nowodajowizoju.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/67347332678.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/29430237731.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/60328346680.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/91560094648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=material+ui+android+studioPDF 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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 17444 bytes
SHA-256: 4cfee2aea594bac8864bf3d4278a1b51c81d784649d0abe2296406a4e980a667
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 10336 bytes
SHA-256: c9a9d75a518acf33277c75bd3e6ae4e933992fa7e6859a49e5bff2823e09d7bf

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