Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9b96aaaf02c78a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 22:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61b6dc2213e6966657c280146e5fb175 SHA-1: 579b1e845f00155988cc1f037b6945a1fa2768f0 SHA-256: 1f9b96aaaf02c78a75e565d98e5cbaf148e97a6a7dad84047534488de4b097fe
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://vektorma.ru/uploads/assets/file/12693834316.pdf In PDF document text
    • http://pierrevillers.fr/mairie_files/file/11628204770.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/85993798279.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/jezajimunawor.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/lakuwesewejoxifeferi.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/xovadonerutigijapipijite.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b00bde9f3---82619105286.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/xijudibovumakujazogopidos.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///pegurulow.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ea6s38l7hlrjmk6lnbijmd74hn/72566484895.pdfIn PDF document text
    • http://greenld.com/userfiles/76846746319.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/66213213051.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/popuvenuselewavexaju.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mafedipupuwotexujolu.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/radusifiro.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/fufakoxosojuvirodevoderi.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/katisuvezome.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/58096909581.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/18245329967.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/goforedozes.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/94647197385.pdfIn PDF document text
    • http://juentai.com/userfiles/files/tebeboboresojad.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134618dc0c91---sawakazemota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+see+instagram+without+an+accountPDF 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_off0000bc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC03 15876 bytes
SHA-256: 388f2734af40e5097c7933ea144a3b06c4c859fbc080351e364b4c6ce5a0b64c
font_01_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 10808 bytes
SHA-256: 87cb1ff58f2d0981c112be033a24d289de74b880bf7355a6dc6a6b436204e764
font_02_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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