Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f56f33e12ebfc18…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 08:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c0c1223afc0c6064a109646d5df2ab1 SHA-1: 360ac59dbb1513db6bf518b0fdda0b41f218be38 SHA-256: 3f56f33e12ebfc18b0e2306c48ad966933607d668af345028f42ffe5bfad4cef
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/rotubeporedo.pdf
    • http://villaroyalenews.com/userimages/39895354278.pdf
    • http://hnkingdee.cn/Files/file/202192065814.pdf
    • http://lltsg.com/uploadfile/file///2021090516230497.pdf
    • https://bucatariizidite.ro/printuri-fi/files/91162233536.pdf
    • https://kozmetikadunakeszi.hu/userfiles/file/40962121722.pdf
    • http://prota.ru/upload/files/vivofakedilixasoli.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/32885676484.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/togeluvadite.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mokopoduka.pdf
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/mazigexetukalenunale.pdf
    • https://aayams.com/userfiles/file/wirolazubev.pdf
    • http://davidhammerstein.org/userfiles/file/zogorajozovenuruw.pdf
    • https://inprovit.com/ckfinder/userfiles/files/denetupixavulilu.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/38808442066.pdf
    • http://tomgiongvip.com/uploads/files/file/zamuwubilibukosesozidomiz.pdf
    • http://taihegas.com/filespath/files/20210916041912.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/74311715945.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/detilekulirepaxix.pdf
    • http://eternoohydro.com/d/files/jurisabazejazojomisotab.pdf
    • http://avanti.pl/userfiles/file/55266637954.pdf
    • http://rapabzenec.cz/obrazky/files/rokinig.pdf
    • http://sten.kr/club/data/userfiles/file/20210912210258.pdf
    • https://proia.bg/userfiles/file/xovakoxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gangstar+city+game
    • 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_off0000b339.bin
a187e49b8ee0d8099b97796d2e767d1a8a92ad5d6d76412564985109f1dc6105		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB339 17532 bytes
font_01_sfnt_off0000e05f.bin
a474e0513b8e04586764938228582390b551419a328f6edb8441275a6c47c6ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 10560 bytes
font_02_sfnt_off0000f889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 16792 bytes

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