Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b7a814251410d5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 10:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 136bd0869325d25a5ae2fe61e495ef51 SHA-1: c3c93a5ca950600f4328e698ad85a2c133c1e6e4 SHA-256: 94b7a814251410d502def72fa2c1ca06bb245d826337a869be1c62c610b4e59f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a 'download button' heuristic further supports the conclusion that this document is designed to trick users into navigating to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=glaubenberg+2018+full+movie+watch+online+free PDF link annotation
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/28588424114.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/bodeninej.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/6917959353.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/75759122830.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/metibufovitujo.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/pilularewunajinubisegow.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/44706303912.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tananedariz.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210915191139.pdfIn PDF document text
    • http://mfcpavpos.ru/file/52944472536.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac1a6e5fd---fumozokuk.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/8825070046.pdfIn PDF document text
    • http://flomojapan.com/upload/files/piteradi.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/19695667624.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/4738448060.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/ropomamasinesipipoforizi.pdfIn PDF document text
    • http://sieuthibds.net/images/files/81434878802.pdfIn PDF document text
    • http://calisnt.com/uploads/files/sebuwozomafi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161341e7dafec7---23993973440.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/wosetujevozenalilo.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/74619215325.pdfIn PDF document text
    • http://mebco.ru/images/file/kobazobow.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/81382140121.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/55879422010.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/87808828650.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/50410429164.pdfIn PDF document text
    • http://feg.vn/uploads/files/mupojojov.pdfIn PDF document text
    • http://egitara.com/upfiles/files/16837202867.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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 17684 bytes
SHA-256: 8a79c807dbb6e1ade29f515a204d7fb444f1acc2925af7a8e6e6ad86efc215fe
font_01_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 11548 bytes
SHA-256: 0a2baade7faaeb8321f321e7a2bc20529c9548b2c4fe8597ac77f8e6d6c37a60
font_02_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1