Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ff2bd06e325dec…

MALICIOUS

PDF

68.8 KB Created: 2021-10-04 05:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a24bf6a5afe5c88affd771744dd9a4e0 SHA-1: 7c60e8667313bce57a1d69c57a5049270504f08c SHA-256: 38ff2bd06e325deceb79398b0a46846438b3a15e5c2fe5690b1295a19a8ea66a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file 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 or link farms, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by leading them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.hkha.com.hk/ckfinder/userfiles/files/lonawovojilexupop.pdf
    • https://mehreganimaging.com/images/upload/files/87066090198.pdf
    • http://staropolski.net/Upload/file/voxozut.pdf
    • http://scamps.biz/userfiles/file/57272270340.pdf
    • http://villapellegrino.it/userfiles/files/dizotovatusaxixi.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613297682b419---pezegixobatuwamuzevajago.pdf
    • http://drumlockingclamp.com/FCK_Editor_Images/files/faxoxubesusa.pdf
    • https://songhong.info/userfiles/file/resirujamenofojisozejaba.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/betafogak.pdf
    • http://lasermedia.cn/userfiles/file/8991977814.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/wubiloxivaj.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614908d30e56b---75665869236.pdf
    • http://chip-chup.hu/upload/file/91887375381.pdf
    • http://altronic.pl/!mag2011/userfiles/file/vazuvipe.pdf
    • http://radecznica.pl/userfiles/file/jibivoko.pdf
    • http://alltechsro.cz/files/fikiz.pdf
    • https://foodthings.us/userfiles/file/79528229064.pdf
    • http://dopuskvsro.ru/UserFiles/68298023585.pdf
    • https://hyosungulf.com/uploads/file/golofotofiwajepuje.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/pepikasufamete.pdf
    • https://stdtekstil.com/upload/ckfinder/files/65428755225.pdf
    • https://kaunas.cvzona.lt/resources/img/files/bojofedeninoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=eating+lean+meat+is+good+to+our+health
    • 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_off0000ad4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4F 16792 bytes
font_01_sfnt_off0000c561.bin
21c88db155578ab5df347c292b7c78e4b8800811b1c446b97493ebef8d83b245		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC561 15760 bytes
font_02_sfnt_off0000ed55.bin
b7a1ad7b5b6c5ce943517e64d5ccbe1c88eeb5c951c763b73b3c1393f9ac0b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 10776 bytes

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