Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc0022cd981d7d2…

MALICIOUS

PDF

73.3 KB Created: 2021-10-03 15:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd667deb242058c2376f3be9890e9c19 SHA-1: 73c716c27c6d6f288a6b3355d34d8cfd5a72c464 SHA-256: bbc0022cd981d7d20ed803500ec78c1a7ddf3b5f3fb1bf8b7d9aa06b10b8cf92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely facilitates the redirection to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous external URLs found. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54c6a0e12---17753242650.pdf In PDF document text
    • http://ukonlinedirect.com/userfiles/files/92149614413.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/boxopav.pdfIn PDF document text
    • https://makenie.com/upload/files/86703397731.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/midakunapaxujaliwebodolij.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lobuviwelanimijovox.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/47881260355.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/mowinirobepumaf.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/68406526735.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/mewag.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/wanoxow.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/likakabigiwitu.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/37733391877.pdfIn PDF document text
    • https://bem-sa.com/img/file/33254994858.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/derijaxoto.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/betatox.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/bagifezubu.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/porevidodub.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/88610196083.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/kevamekowerozafawagusimos.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/35336981799.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/pefazoladaze.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/xazofigijulebujesesel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=emotionally+unstable+borderline+personality+disorderPDF 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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 17816 bytes
SHA-256: 8c83d99ee5a3253b1811a5a641d447e41320036fe7bdeea9b5abf3b90435e3ed
font_02_sfnt_off0000fe21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 10892 bytes
SHA-256: 84bced5af08e5534b0b11220f2fc81b48112cefbcf23419fd6147829877ea296

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