Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6d8228ee8d7af3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 04:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17d9e803a3d7c439d54e333b4bb27feb SHA-1: 0f21f31ff27101429436431b76103ef2acbf3da3 SHA-256: ec6d8228ee8d7af349f38cd30fdb35bf071a750f9966dda94d71886888e14dc7
134 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 is part of a link farm on disposable hosting, designed to redirect users to potentially malicious content. The presence of multiple external URIs, including one with a 'restore screenshots android' UTM term, suggests a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=restore+screenshots+android PDF link annotation
    • http://ilkemymm.com/image/files/50145261940.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109170131251608.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mujinodonitujidowurisada.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210901125412.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/tumovo.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/95025033480.pdfIn PDF document text
    • http://ingore.cn/upload/files/tesegu.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/23209171102.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/12654624780.pdfIn PDF document text
    • http://domario.ru/userfiles/file/42531787704.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109222014154929.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8d47f5c88a82485fa66c4d7f2662a536/33531216092.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/vuviginafumekurolo.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xitufupifet.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/tivavipesuj.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/64916052584.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e8c589ea3---xepibuxebavanapoj.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/wivum.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/kepuxasiberit.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/kuzepobasax.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/nexunepezusolevix.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_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 17028 bytes
SHA-256: d0c84f9e204988502642d1810278a508ab11244b29cb19f56b5f5ebab28e92ab
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 10468 bytes
SHA-256: acf4dcb2d23135a305f5ecdd12c425081f2c664489e091021a31a649c04d2948
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.