Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f3331e9b4fdcad…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 16:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a17193b4d607c756455dbf16f1519a6e SHA-1: de017a57fdb7932e2d0ca34b12b2559d0e1c2bec SHA-256: 34f3331e9b4fdcad2b2bbe661644a8965a298ee8634c01845749fac5624fbb43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The 'wkhtmltopdf' authoring application and the presence of embedded fonts are common in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=unlock+mobile+without+losing+data PDF link annotation
    • https://cmoretv.com/userfiles/sewoso.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bupaxipomidakobajun.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/91865061521.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210916_31B6615FD4AD2B81.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/voraluvifukovadugob.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/vififodaxesure.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/efce06aabc027908ff03ead1df914d30/89536842050.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/33717675959.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/sagidemu.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gabuvuzimugomuzafuke.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/selokinodizozafexibeloban.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/55350647702.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/vijijimivolafenasovipeg.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/senesixinipasawupajono.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///11102447932.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/dugotizixoxeweluwulalu.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/bunutakufokor.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jutovoxexasutelaxapaf.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/5119971374.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/16936329626.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130278b4f087---81796234044.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/buzojotenowewujaf.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/kovivomatuviribatixim.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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 11144 bytes
SHA-256: 52c922f023b83fb78fda3fc26be5a06bc98811ddde044f36856ffc3278edab09
font_02_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 17500 bytes
SHA-256: d2faef15389bbc265e8321a9221a37cbd7dd1189c31354a2c6089714c77ba2e2

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