Malicious PDF — malware analysis report

Static analysis result for SHA-256 8801d26c7213ba96…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 19:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c078db6a8aa02a626dad182b92eadbc6 SHA-1: 0c7c85c6793292728e715f9904c25c3e3d7f8ca5 SHA-256: 8801d26c7213ba965a1ff1eed3bb54c430104e3378a2e53d0aac9842256b2516
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggests a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eco-translation.ca/upload/editor/file/barofavawa.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/rabilesilikamefajenaxag.pdf
    • http://bresky.cz/res/file/12379328359.pdf
    • http://razaviota.ir/basefile/razaviotair/files/41411928154.pdf
    • http://shijijiaming.cn/filespath/files/20210909191614.pdf
    • https://areopag.ru/sites/default/files/uploads/tutulavefe.pdf
    • http://sh-songshi.com/admin/upimg/file///puxonekodefokamivezomo.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/buzede.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ad667662cc19f05fd78eccc4f0f09a3a/vofonesisutuguzimigitima.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/76018702190.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/39216753089.pdf
    • http://risme.vn/files/2152776005.pdf
    • http://bulmarconsult.com/files/53307037393.pdf
    • http://zzps.pl/userfiles/file/debolobaf.pdf
    • http://a-b-i-s.net/layout/bilder/file/46952495562.pdf
    • https://cevhertemizlik.com/userfiles/files/wuwojibirisepafor.pdf
    • http://lexxyin.net/files/fckeditor/file/viwej.pdf
    • http://fkhd.cz/data/img/64504621599.pdf
    • http://orderkai.com/uploads/files/19827931896.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29913bf33---muwolatulefaput.pdf
    • http://haliburtonhighlandsheritage.ca/userfiles/file/bazexojirojebi.pdf
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/59909585067.pdf
    • https://jgranit.pl/userfiles/file/poxuzuneregunikejaruzo.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/buluwajim.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/tivupezubiziruri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hack+tools+for+android+no+root
    • 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_off0000ebef.bin
60f3ffeac95274b1cecf714ec0f9dd41bbc4d4e398b48fe8ae2ed5545bcbcc69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 17092 bytes
font_01_sfnt_off000118ca.bin
e2af558c713e221294e42cf35b271249437d99078e6f8be29920bf3a6d276a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 10420 bytes
font_02_sfnt_off00013080.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 16792 bytes

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