Malicious PDF — malware analysis report

Static analysis result for SHA-256 905f9ccdb8483214…

MALICIOUS

PDF

68.7 KB Created: 2021-09-10 15:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bbd1a0a9542d71675737b78e8544848 SHA-1: 78e899436412b8177c396e86b63eefee2cb8eb31 SHA-256: 905f9ccdb84832145366b2724319e8d1ba5af36f35d6b95cf9adf4188666c1d1
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document's purpose is to redirect users to a large collection of other PDFs hosted on disposable domains, likely for SEO poisoning or to distribute further malware. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gptools.net/userfiles/file/zenoratiwejirapodosi.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16130216ff0d94---nowaxugapupuw.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/26045960408.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210909_2DD50E6DC67823D4.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/20362756060.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/83635629806.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/velinopajorazegoz.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/sujavufavovotisozavan.pdfIn PDF document text
    • http://enewind.com/pliki/file/41223466492.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/74638388737.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/24245058368.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/susurodozorojisaxoxonujep.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/leregisipevin.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/73899641444.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/20848391951.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/75958818184.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202198194769386.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/53807152400.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe76987697---36905358211.pdfIn PDF document text
    • https://rosycaffe.com/file/65270565172.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/felitufokajibakaxux.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/jijem.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/88921613241.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/89683582141.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/93774167054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+mi+4a+pro+tv+with+mobilePDF 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_off0000affc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 14508 bytes
SHA-256: 1feaeae85b057f9c22fd85cabd59b0d4f9e99a51383593e5694f79121e4cac0a
font_01_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10832 bytes
SHA-256: 033a679fa8dd985c311005beb2594d1303ad8b927bc6857feba4d32a0e5a3a1f