Malicious PDF — malware analysis report

Static analysis result for SHA-256 f427d4cf4a2cb493…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 09:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8437cefe59af9a3ae6a1e66b55a9d7c3 SHA-1: af1d04abbe79253e7702f258f4c04bae5ab03650 SHA-256: f427d4cf4a2cb493e5c91e1280f58f11a4bdac8372dfbfb6148097263a70b017
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the classification as a link farm strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://inwebjor.ru/uplcv?utm_term=virtual+android+9+pubg PDF link annotation
    • https://svltv.in/userfiles/files/4204416575.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/kudozisosufaxupijufesos.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/98078313127.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/58853581308.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/nugipasabusop.pdfIn PDF document text
    • http://dytac.hk/userfiles/limojokinusoxelegu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/9561444743.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/nomomobigefumeri.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/63456816871.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0719d4400---vusaki.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/bimiziweletalugavatukiv.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/vudonuzuraxoxurugonabudik.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/derimirufoze.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d0af8cfda30b876b25b6e1798096e290/nadirilozazojasanivuti.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/94958189809.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/54855338375.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/88131019747.pdfIn PDF document text
    • http://heizler.hu/files/file/tejibuliretelaxusol.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_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 10644 bytes
SHA-256: ea5c103aa8cf8124377d109b0ffd4d8b02784d6648745692388d257c66ec3e32
font_02_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 17992 bytes
SHA-256: 2ce833503eec42d509332457598d89cdb080811c13b77ea86fe037a36d034e08

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