Malicious PDF — malware analysis report

Static analysis result for SHA-256 74db577e9aa84fb6…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 10:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 03d90b06d7b57df575e368196e276da7 SHA-1: 412a0bf7d58a1de1a712704dac5872da4cd08e89 SHA-256: 74db577e9aa84fb6e01200b8b9e88917b2ad5c764dc03623d34b7923a4fd81ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://qunjl.com/userfiles/files/21775821186.pdf In PDF document text
    • https://eobliecky.sk/userfiles/file/41659027637.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/vukotijitawusuwigox.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/xesodavesazukiwaz.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/74360877586.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/72812055042.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f831e655baedb46ac9ff396d9ed2acb2/dobomikudigejunixawobek.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/gefevo.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109282154196354.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/bowijosumedi.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kesut.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/27/71938857964.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/kofidajusades.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/434563105.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/41292767025.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/xorapavojotamikidexofabex.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vawiroparitifodewexe.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/12924332855.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/51438036230.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/81095882504.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/67810588329.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/fizibeju.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/buniwuxogowenokufuduze.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/90269943580.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/gugudivaragikulo.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/11440888073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=real+life+application+of+one+to+one+functionPDF 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_off0000b248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 16328 bytes
SHA-256: 926d9711a1471365314e03b24a6bfdb2526777191489772603b1345d99769697
font_02_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 10352 bytes
SHA-256: 1a64cf5edea862c19dcb56458f7322ba1eb752ad55d01b391773ddbd20ecb61e

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