Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f78bbe3414942c…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 05:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c922cf8bb0171cb772e99e547937ecab SHA-1: 8d007074afd3b3854aff1f5b4c79ade73cdc053d SHA-256: d2f78bbe3414942cd9633eba31d70cd5f10843d73dbb9e4aedcf5c56ee687a8b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection and a high ML classifier score indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm, likely for SEO poisoning or to distribute further malicious content. The embedded JavaScript is likely used to facilitate the redirection or download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://medical-1669.com/userfiles/files/21763723844.pdf
    • https://digireg.ch/upload/gugejikixas.pdf
    • http://artemon.nl/userfiles/file/92012903357.pdf
    • https://sanaspinler.com/calisma2/files/uploads/22818729741.pdf
    • https://magatek.com/documents/file/11475717560.pdf
    • http://dyccpharma.com/upload/files/53436001017.pdf
    • https://lotteppta.net/beta/assets/file/4903347568.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021981227457191.pdf
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/raselareru.pdf
    • https://coherence.cz/userfiles/file/toradoziderijotavulomape.pdf
    • http://merklink.nl/site/data/ws/files/86296351861.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8ceffcc1f5538847ef076f808b64e5b6/falox.pdf
    • http://forspeed.cz/ckfinder/userfiles/files/71783787832.pdf
    • https://neksav.com/upload/ckfinder/files/wuvati.pdf
    • http://daiichilogistics.com/uploads/news_file/kiberorakajaxo.pdf
    • http://kant21.com/userData/board/file/70307016635.pdf
    • https://vas-vill.hu/userfiles/file/64781050989.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/20988858036.pdf
    • http://euroambulans.pl/userfiles/file/91932833190.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/92186643700.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/33470765559.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/86475540399.pdf
    • https://www.aicsmindia.org/ckfinder/userfiles/files/nerexenofebu.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4942c2b6---rafofuvelerami.pdf
    • https://reparation-mobile.net/userfiles/file/fozogiwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=naruto+blood+prison
    • 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_off0000b778.bin
472f54e324388f14d9fd933029476053038904ad1c730e179f1505643eb27baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB778 20184 bytes
font_01_sfnt_off0000ebc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16792 bytes
font_02_sfnt_off000103dc.bin
f18a31cd5ea8d9f27cd8312db005ad21e7542b2e8ab00b9ff1ec8695e2060d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10468 bytes

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