Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccc490bde6cbac9…

MALICIOUS

PDF

87.7 KB Created: 2021-09-09 13:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2908256ad85e9b28121d3115e95a6a4e SHA-1: 2e8568cab4ffff06b23206dc9263d311e66f6770 SHA-256: 6ccc490bde6cbac91dcdb6c1c71685cdc201d68ec7b28bbffd97752ce830361b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ff-engineering.com/userfiles/files/49892645238.pdf
    • http://printific.com/images/contentimages/files/ferufeduxagokibowawa.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/turive.pdf
    • http://w-mill.jp/images/file/68397078811.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kejifaruvolegiti.pdf
    • http://ty-universe.com/image/files/20210903_133656.pdf
    • http://ahlhy.com/uploads/file/050634518128.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/nexaluxogebitavaji.pdf
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/45644462234.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/41242713915.pdf
    • http://s4l.vn/storage/ckfinder/files/66697603652.pdf
    • https://maintogelonline2.bet/contents/files/68224086178.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135683ec8ef0---90226217062.pdf
    • http://jongauger.com/userfiles/file/31663547442.pdf
    • http://cserepakciok.hu/xdata/file/25225768246.pdf
    • http://seowonbattery.com/files/fckeditor/file/19466158316134c47917e5d.pdf
    • http://pomocnaukowa.net/Upload/file/39409917815.pdf
    • http://dalaichau.com/files/60092257957.pdf
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/piripututoselavoju.pdf
    • http://quatanggiabao.com/images/uploads/files/bubaxopufupeto.pdf
    • https://careersourceokaloosawalton.com/files/public/xagotobozinukebiminanut.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ddd4e5e50---88077707356.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/moson.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bnha+season+5+episode+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f363.bin
fd6b6df9b8c46b44c2586856e1d5d3d93f904bad0fb67cc4401f2da06579284c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 17616 bytes
font_01_sfnt_off000120dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 16792 bytes
font_02_sfnt_off000138f4.bin
32e4b14d53af88f289b4f8c93bbb49849216d079157a06e3814b3f450e0d6332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 10604 bytes

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