Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1e5dab1beaf39c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 23:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa5a07e94afe1a0db0a408e9d10f3bb3 SHA-1: e8426fa0e7a13e2296ac935fc089e815e50c3dfb SHA-256: 0a1e5dab1beaf39cdda5e91516cb5ba99bfb5b3cbb8ab907f8401178567b5949
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a malicious document, likely intended to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tavio.ru/files/file/21312633822.pdf
    • http://superfasttv.com/uploads/files/zevoxedafawogejiguzifo.pdf
    • https://hw-power.com/uploads/ckfiles/files/613a80228d780.pdf
    • http://namlinhchisapa.com/userfiles/image/file/92035117419.pdf
    • https://confeccionesruiz.cl/UserFiles/File/nomaregogejodakijufavo.pdf
    • http://paradoxine.com/upload/files/tovosoxesa.pdf
    • https://accuratesearch.com/userfiles/file/5513460258.pdf
    • http://hanart21.com/files/userfiles/file/79953045240.pdf
    • http://mg001.cn/upload_fck/file/2021-9-11/20210911215936108197.pdf
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/86601189251.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021091303002773499.pdf
    • https://ebooksweb.net/files/file/vosanobiruferasuluvuzer.pdf
    • http://portalcom-b2b.es/img/user//file/_0934003001630548131.pdf
    • http://salamino.pl/userfiles/file/fetel.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dorutirevavo.pdf
    • https://slide-bearing.com/d/files/zujefimejinape.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/bivutuzajubudefupikepogaf.pdf
    • http://groupkaishan.com/d/files/42578717122.pdf
    • https://jagominum.com/contents/files/zupit.pdf
    • http://narnivet.com/userfiles/files/78971534839.pdf
    • http://phayaotechno.com/UserFiles/File/64993977945.pdf
    • https://noriupapildu.lt/ckfinder/userfiles/files/vudavumak.pdf
    • http://rockefellersgold.hu/editor_up/13533769931.pdf
    • https://ukmalayalamnews.com/userfiles/file/25365157336.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=all+pokemon+rarities
    • 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_off0000b4b4.bin
df35e629e3118580ea5625fd7e15990c467bf79cd1ba317f3c9c345f4500548b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B4 15860 bytes
font_01_sfnt_off0000dd05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 16792 bytes
font_02_sfnt_off0000f51c.bin
fb083689226ef5ab55413bfc55ddb2c29407ab73d8f7747fbae5cc7186e9e985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10484 bytes

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