Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a73b3297797c6b2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 09:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b0af24310af878b391a658d0add2a76c SHA-1: 83b4040be3c781c843a42f7a2ae95bb585342326 SHA-256: 0a73b3297797c6b27c6c984347d94ee1e0168e4291774f29b7f46865476d33d2
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 likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=attack+on+titan+tribute+game+for+android PDF link annotation
    • http://sooam.com/files/fckeditor/file/1266142753613662161abe3.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/18973658755.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/ferurifeleropof.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/64573193745.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/janosazitozo.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/74796707623.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/45931182260.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/mepobafekefa.pdfIn PDF document text
    • https://semut73.com/contents/files/jobotipojigizirodigukumej.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/sibaletukusefuxaterires.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202198159149774.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/96681740819.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/56998358366.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/wimexodatozosipotuwemew.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/60951927954.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/komuzimalesu.pdfIn PDF document text
    • http://robbes.nl/media/files/fubudigobojurugobekitotur.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/17241693871.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/72923976997.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/91915094280.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 10920 bytes
SHA-256: eb5065af0adb8327a33c86b270b96c018066c9ea95632cbf886fca293858a565
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 17892 bytes
SHA-256: e18871e0169b1c1c73629ecdb526610958a69974a578865ab0e99221783ffdd5

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