Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfe935e9dec5739…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 19:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17db5d04cb86dddb3611d10e7057b37e SHA-1: a638bdb579485ba1794b2dd22e34ad60a17540be SHA-256: acfe935e9dec5739dd5bfd5aacb2cccaf20e60f46d3e49c4e1db1cf5973b5220
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm configuration. ClamAV and ML classifiers have identified this PDF as malicious, likely a phishing or malware distribution lure. The presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=castlevania+android+download PDF link annotation
    • http://newshop.jp/archive/file/zizuzizuji.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/11931140274.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/debuzo.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/35485633739.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/66811703189.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/65334920218.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/72111652652.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210905151434258.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/zonoxijivofogefoxij.pdfIn PDF document text
    • https://terracell.pt/images/file/junavawifi.pdfIn PDF document text
    • https://bor-diing.com/upload/files/wodeniwobab.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/9372304177.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/37696711125.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/76520194637.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4f689179---22408263526.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/lazawefuxikuwome.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/42768096712.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/81738625121.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/21942573847.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/jifubemafatu.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6ea95921a04e04e01136f8bc006380ea/guwuwatavufimorukameput.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/nanosizixuzem.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_off0000d165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 19392 bytes
SHA-256: f27ddc989deeb85418b57cc92d82300d7e370ca28f1b3507ac155a982f0064c8
font_02_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 10424 bytes
SHA-256: c5c0ab41f429ca574106dc007451ca624803579ffae345a8b83be4f84c5c4cee

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