Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c2de61ae3bd19c…

MALICIOUS

PDF

89.5 KB Created: 2021-10-05 10:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c48d41cf2c85c27346abc2ab1ad143b SHA-1: a9be86a722263e38c41e59420a46434fee1d9c6e SHA-256: 53c2de61ae3bd19cd0b0e8cb8c5349213a747c90d3c1c3fc764f7590fd12a9a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to redirect users, likely to phishing sites or malware downloads. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://birudongker.com/contents/files/82894544796.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/dewale.pdf
    • http://hieuchuan.com/upload/files/jeporokugaguwigarem.pdf
    • https://footballsod.com/images/ck-uploads/files/nurexukebetegelubu.pdf
    • http://apexnepaltravel.com/userfiles/file/14286460990.pdf
    • http://preciz.com/uploads/wysiwyg/files/30097781928.pdf
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/mogulewajitifiv.pdf
    • https://gadd-asso.org/userfiles/file/76146720029.pdf
    • https://landtop.com/filespath/files/20211004145620.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613572c3a7aad---51581433985.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/tuzezidigomaroniziz.pdf
    • http://gayaarchi.com/userfiles/file/20210929041403.pdf
    • http://dallard.fr/ressource/site-image/files/terafinobemubutegurufe.pdf
    • https://groupunsur3.com/contents/files/zalavelibu.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/93889260980.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/zonadarokudimedobiwi.pdf
    • http://zzquansu.cn/d/files/90786201365.pdf
    • http://cupta.org/userfiles/files/20210911174802.pdf
    • http://pensionpoint.cz/userfiles/files/wulefabuxatirunozizogu.pdf
    • http://epoch-making.jp/js/upload/files/zadonekepidetumizotuno.pdf
    • http://adaviestransportltd.com/userfiles/file/29900803922.pdf
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/xosarozafitevanebigo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=love+you+to+death+song
    • 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_off0000f1bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 16792 bytes
font_01_sfnt_off000109d1.bin
a422c231546cadc5c41d9aeb59e462ddda1f25460db97cec0bcc9fe56bd230e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 21260 bytes
font_02_sfnt_off0001409b.bin
72fd2da4141336ed5fc90034d0e99a60270cdd081ee02fb3db0ab28c7167268d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1409B 10524 bytes

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