Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f79adf16fa3f8f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 09:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7aeced6f1e87e3ef8fd7db1acdaec86a SHA-1: 25b1d207288a07482a1f55a687a0dab988a91d05 SHA-256: 37f79adf16fa3f8fbc561a265077cc0499e8ebae16db202ec45960b273f310df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a non-clustered link farm on disposable hosting, reinforcing the phishing/malware distribution hypothesis. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://chcial.ru/uplcv?utm_term=antarctic+adventure+nes PDF link annotation
    • http://picassogift.com/Uploadfiles/files/83565038049.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/xujapebixapuraluwabejurad.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/gibodamij.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7448dabe---fimozawerabovorujasorabo.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/bipiguwevupada.pdfIn PDF document text
    • https://esvigo.com/upload/files/lejegowaxiniwetoneban.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/10322636468.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/9777231489.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/pakubibawokomafemen.pdfIn PDF document text
    • http://wohntraumgmbh.at/sikafarimotugi.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/mibukotujixozifowil.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/jemonumasuv.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/68511967633.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/sejigeribesar.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/vopipotowesogugema.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a9a2f2ee---nafumir.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/91245205785.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/jibavokudigezenenim.pdfIn PDF document text
    • http://apart1day.ru/file/51001928792.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/6046760457.pdfIn PDF document text
    • https://tele-video.ru/upload/files/munotexopelidegaj.pdfIn PDF document text
    • http://terrietanaka.com/library/files/64104941743.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/78627545968.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_off0000c4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 20836 bytes
SHA-256: 7ca2a7bf2eb646159caf2358adff8264d90292adeb6eeceaad0a010083e58475
font_02_sfnt_off00011315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 10344 bytes
SHA-256: 136883d624ca7df1df94b8e0695dda0d170e172647ed8cf7619e88f3dfd17259

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