Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc7d9877768f0e4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 13:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3791883623eaaf12a9ea29e6850a9366 SHA-1: 29ab94149e8deaf0e60469d54df8d6ce5ab6e044 SHA-256: 9fc7d9877768f0e422cfdad6b0708b2a46d8edb2069b1b2e71c88eb116a1a8c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

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://philabc.ru/uplcv?utm_term=the+little+prince+free+pdf PDF link annotation
    • http://genbreedpublisher.com/files/upfiles/file/mafanotixanokopumofosu.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/53673472100.pdfIn PDF document text
    • http://myslizdrave.com/soubory/fikuzegi.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/kiloxurerenusetorugoben.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/95331089726.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wakoso.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/72188842843.pdfIn PDF document text
    • http://momsystem.ru/public/file/8936242728.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/vekalefoxasemixoromof.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161322478d8e0a---79735195724.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///vogisenasijefiwapoxiwu.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/matiri.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904210823487531.pdfIn PDF document text
    • https://htchninc.com/d/files/vakusujajodipadi.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/suxaxoxekanorafumave.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/79075922411.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/biwulimuzibojaboloma.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/wemerulafujubanig.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/konafukatufiselaxufo.pdfIn PDF document text
    • http://belst.by/upload/file/36916781520.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/sifipulibanoxebudosokek.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/kakopeliwalesigarateg.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/60325412045.pdfIn PDF document text
    • 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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 10232 bytes
SHA-256: 5a3e5c6e93a10da70455612d58909bfbba3bff8a145a398756cfd2907b35179a
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 17788 bytes
SHA-256: 5048da6b3739f83c302d513edcee7577a8556740f21afe605d81d087de891073

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