Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5df3701cd664d0a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e639dddf858a2d818613284646f8d3ec SHA-1: 33de240a58b8c616e960d188f18a9b59e3fda2e8 SHA-256: d5df3701cd664d0ac2972ee8fa16b061f8ab4f7eda4667d26eedadc7642fc65e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://belly.bpv.su/content/files/files/1047008535.pdf In PDF document text
    • https://motoquadro.de/userfiles/file/1340839409.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/15661032578.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/93391326655.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/tedemame.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/gelavigidarilewufejetitow.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/30796103587.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/gemarililekabobabaxe.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/jisexunol.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/73866356409.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/43693278923.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/95116339596.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e03149c55f---25785215841.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/xasomewamibojamo.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/vamabativosuji.pdfIn PDF document text
    • https://nexapos.com/upload/files/21594510019.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-23/images/files/46128953026.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/72369632699.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/55750705542.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/92006073983.pdfIn PDF document text
    • http://webursitet.org/Files/file/22925923681.pdfIn PDF document text
    • http://topstec.com/d/files/23955818269.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/17280238151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+11+equalizer+settingsPDF 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_off0000b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 15728 bytes
SHA-256: 31a7c49a14ed7dee3c4be52084d73af4f506768341bcb57911974f5a556833af
font_01_sfnt_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 10764 bytes
SHA-256: 4fe75fde7d2b19c72fe2f900a0973ab7bdce6f4feb29b4ca0953e81300044fdf

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