Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf99a9fb265798b…

MALICIOUS

PDF

119.0 KB Created: 2021-09-21 14:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34abc95a14977fc6426044b34a7213a1 SHA-1: 34c6866b1e26df688bc5f43abefc06d865348c3a SHA-256: 1cf99a9fb265798b793b4f104e99711159fff21399a93f0c37b729a38d7443fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, many of which are unknown or potentially disposable. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://planet-pvc.com/upload/files/47017820519.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6765f4d344efd7b143e60e7583f52ebd/16249001689.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/dirazowativ.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/mufazovutovepibeluk.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/20888613923.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210901181530.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/87577011910.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/botisupejopugulalajafinit.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/tagomerak.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/15253457374.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/67588897789.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/81563131159.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/38c094ff93a6f4b9defef67d5f0d60b5/14135616892.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/rajafavatazeji.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xupujetidivimotuni.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/30026010742.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/52823598905.pdfIn PDF document text
    • http://iphysiology.ru/upload/71206594954.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/63940320736.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/xoxaretaxajamukepebaza.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/runolun.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/41333470562.pdfIn PDF document text
    • http://rsentco.com/upload/file/bopugazilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ipad+pro+vs+surface+laptop+3PDF 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_off00016b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B0D 19360 bytes
SHA-256: cebebabf69069a982bfdd40b20f06fef43abb1b36c83a3c94a2a1061bf0e00e2
font_01_sfnt_off00019d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B559 10704 bytes
SHA-256: 2f9d861730ce6826bf35fe9ec8aa7821a382a99ebaf1136f9fe1486eeb498ca6