Malicious PDF — malware analysis report

Static analysis result for SHA-256 14948cfae4f61685…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 05:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ce8df305729d179387bba2650d15e2a SHA-1: c4a84c45159b9291a7efb68cbb002ccebae7ce37 SHA-256: 14948cfae4f61685f96c43e078da9c369063a1a4dfcb6bf772f9996b6b79885e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, common in phishing campaigns. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://newtarrytowndeli.com/uploads/files/wunalevigavedemafisigu.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d087665671---vofigolipemujarut.pdf
    • http://qdxqw.com/uploadfile/file/sokorawabavozonev.pdf
    • http://archifolder.com/userfiles/files/46706190982.pdf
    • https://fong-cai.com/upload/files/22254908956.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/gilozorekubofuwuw.pdf
    • http://buydecor.ru/uploads/files/madosozidu.pdf
    • https://grupa-energia.pl/attachments/file/kevisikumepunosa.pdf
    • http://duepassidalcentro.it/userfiles/files/82509719977.pdf
    • https://mariellatriolo.it/public/file/tufuvu.pdf
    • http://farmaciacogliate.it/userfiles/files/zafukunuzajenu.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109121231226389.pdf
    • http://web5gstore.com/Files/files/45676389688.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/fefutelobokopon.pdf
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/sotokuw.pdf
    • https://processwork.archerhuang.com/ConImg/files/navaroluf.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/dirufosuti.pdf
    • http://dianacb.cz/userfiles/file/zapatenemuporofalopesim.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/xubukawujetiki.pdf
    • https://dzido.pl/userfiles/file/wugunovexekadagi.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ddb962d61f8105717932ba5cfa0c40b9/dugozizoj.pdf
    • http://vattuxaydunghl.com/userfiles/file/18720166210.pdf
    • https://cytokin.ca/upload/editor/file/58589293772.pdf
    • https://gruppopolidori.com/upload/image/file/19841030392.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/logiwaxevut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+l+word+season+1+episode+4+watch+online+free
    • 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_off0000b12b.bin
5b9d793d463422dc242c5c897f84a5368097901489d9a373f18396f241dcc915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB12B 16640 bytes
font_01_sfnt_off0000db47.bin
57a02b5b55b76e78c8379251031eba4f9869803e0afa4df8eeeb8708decf27a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 10896 bytes
font_02_sfnt_off0000f498.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 16792 bytes

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