Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3a956fc211d5f4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 23:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bf62ecfeaa61008b548d54c08b967b4 SHA-1: 58841fc137ba514fdab84fedd0a8d0913106615c SHA-256: 7b3a956fc211d5f4629ce02abe7da31afdcc069b2ffd0669120244ade9869572
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of other PDF files hosted on various domains, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://phuwangnam.com/user_file/file/vovazatotoxoduwifagu.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148181cb78db---jasutowuwibulawezarupodu.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/11447783730.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/vafekuzaned.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/29104152272.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/36411174472.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/24577344280.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438bc407f66---70713245501.pdfIn PDF document text
    • http://irollee.com/userfiles/file/81812819453.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/kisatipufafobimixodepitel.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/9901534752.pdfIn PDF document text
    • http://zenithmetals.com/files/23831146198.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/55847300458.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/90772541955.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/25331232896.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/63389581232.pdfIn PDF document text
    • http://congtyvima.com/images/Download/65063976349.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/zelinubirevevijewupazela.pdfIn PDF document text
    • https://mauspro.net/upload/files/sireteripuzimesoluxesidi.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/52619408352.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/55668791095.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/83627117335.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/lowenagisoxopatikidewotam.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/56770634804.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/53841709441.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/63054951942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=modern+warship+mod+apk+unlimited+moneyPDF 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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 11044 bytes
SHA-256: 221d549b5a29ef06b84837356fdcff8f1a4dcb358aae02eefce942137821e00d
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17624 bytes
SHA-256: 99290ab1c41cc95f5dc116b56838f6252c92c8ebf20078ee58764c3bc84cadc4