Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c686c9956fb9d2a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 15:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c63da46998ccee67caa38085bd4dd6bb SHA-1: e158e9eda6815721277cd5f04ff8b2f1c4bffd7f SHA-256: 9c686c9956fb9d2ac3923ff31efc397c3c1649a24cfcc5ea46ab68fe390034c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features a large number of external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://efficientinfocomm.com/ckfinder/userfiles/files/15907829264.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141775e0d9b2---mudasaxilekageza.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93705292770.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/396101503.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/sejewutojapejatasumudukus.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/43572950508.pdfIn PDF document text
    • http://gospodarstwotoporow.pl/uploaded/file/10898227156.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/53685390468.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/surubifadowojixiwimakev.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/3917149713.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/gudasevodefaguvuj.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/53075258304.pdfIn PDF document text
    • http://liily.jp/upload/file/20210919234653.pdfIn PDF document text
    • http://belniig.by/public/file/89059981226.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/fejoridixedevavofukusix.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zenip.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/87ccba63083772f0bab79af02e0ea150/kadozebavubenanejovanirur.pdfIn PDF document text
    • http://nanopena.cz/upload/file/gamoresiripakadara.pdfIn PDF document text
    • http://allergya.news-read.com/upload/files/gudowanig.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210916210849.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/66624736594.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/ziwisibexiwidixesetalekiz.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/lugitarapiserotabirile.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/34597440461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+change+the+imeiPDF 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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 15972 bytes
SHA-256: 066a8dda8b193e0d7e91369b81099f9cfdd3da40a1cca48fcf4bc21c218bb7c5
font_01_sfnt_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 10440 bytes
SHA-256: f27e444c9c5a95766d78479d1206288b8daf52a28108d6c155e4441ae5d39631