Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cef33432b27c10…

MALICIOUS

PDF

72.5 KB Created: 2021-09-23 01:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b43dae7b48d678ede394dd6d51966b1 SHA-1: b0c4997a92b6382d45a7d94c821ce738f0d8d5b3 SHA-256: e6cef33432b27c10dc6013eb60096feed5330a4364fc9ecf78b1e39c7dd88b7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=agario+server+list PDF link annotation
    • http://stomerijindex.nl/images/uploads/32009722663.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210916221250.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sabetuvewaxasusux.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/nivofalotamusilifodo.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/dixoxodedozaluxininug.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/66513015891.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-20/20210920181646215608.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/87625205384.pdfIn PDF document text
    • https://asken.as/bilder/file/7519948258.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/jukopaloxo.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/74709649367.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/bejitubatoseku.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ceb7c9e4---96906483042.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/46564070750.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/zenarigojobozop.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/vusamagidaxofe.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/26152387433.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/wovezu.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/reletexenipozuzofezo.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/buvujakimetokenav.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/69498260449.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_off0000b820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB820 10224 bytes
SHA-256: a72d931befe739b5858a8f0dfedd44dce7aae8b30e62211bfdbbbf885d6b6b3a
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 17376 bytes
SHA-256: 78661417c1e662f7cfa8129dcb2ccbd8f9da82077aab445ce4b5152e15d1edc4
font_02_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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