Malicious PDF — malware analysis report

Static analysis result for SHA-256 6792ecba073aec08…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 07:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba615fb8b704e1fd09efc9a39496e6c9 SHA-1: 98755bc4018082d175cffae12f067f4aeb949ae1 SHA-256: 6792ecba073aec081dbadba7979b26cd311bdc68c2c57ce34ffe1304affb8843
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable hosting sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggest an attempt to direct users to malicious or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://women-for-marriage.com/ckfinder/userfiles/files/90434592470.pdf In PDF document text
    • https://fond.ru/userfiles/file/42391725691.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61333d64d2c60.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/56710840428.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/8910561367.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090705520112.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/41272250301.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45162350602.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/90691847411.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323eb5e72bc---renigijona.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/jozujiseliwosejibaziwow.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/64360130322.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/3973003576.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab5b5154---suzibinomev.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/murijiko.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/wofujisixukusotugagarebak.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/gidilifipof.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/74321912212.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/51191792375.pdfIn PDF document text
    • http://simonide.org/userfiles/file/zevazeputifelujoxatifi.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/39814787190.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/zopuzurisefagosuzusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+photo+grid+app+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 10784 bytes
SHA-256: 8fa46237440e7d178998ec6aa30acb655d5264d54bf029ac780c4a7250c564d5
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 17376 bytes
SHA-256: 730c5b5ccd9880e0de99f30e28560f30bdbbea97ab3811629d1a22212086a7e4
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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