Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cbc40fbdecfaee…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 09:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81b1304192d0869a5cef612fae1e8254 SHA-1: 3848c2093c24555a41997285eb79710cf79b220a SHA-256: 55cbc40fbdecfaeeb8147d6df9946b09781a1d57e3b21f67eb40ea21e9a23815
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. Numerous external URIs are present, suggesting the PDF acts as a lure to redirect users to potentially malicious websites. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=delete+texts+android PDF link annotation
    • http://climacom.eu/userfiles/files/rilurakerug.pdfIn PDF document text
    • https://finliz.lt/i/File/zatusifidexuxexomilog.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/38201937062.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/86509143246.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109110031569712.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/90702538204.pdfIn PDF document text
    • http://ping-property.com/user_img/files/xiruvax.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/viramikudozitaposazolef.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/27969649646.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/41318542240.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/vejovadetetun.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-16/20210916103707669053.pdfIn PDF document text
    • http://kccmaul.com/files/files/mojugosozoxurotalevamiruv.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/44854610968.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/43382258068.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/88973716442.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/xasolasaxatududox.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6e7618af---kujukewufabino.pdfIn PDF document text
    • https://securitydm.net/slicice/file/20988151799.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/63839730295.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/26916552653.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/gekivuluxuxetarumara.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/bisarigikuzinadage.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/85189473902.pdfIn PDF document text
    • http://rivucota.com/upload/files/35563727619.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_off0000c02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02F 10344 bytes
SHA-256: 14819f1a69985382aae0de981f28604864981586c38e4acd6f8267d116113ae2
font_01_sfnt_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 18076 bytes
SHA-256: 0fcaeb061b871533e85e99402fe58f3b0a23c68acdfb9dc30ac61787003998ed

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