Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8dfb0c729e28f7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 19:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e10983097bd3d74c7981f551cdac27e4 SHA-1: 66ca2c6e9af40a392466f26ef2f91380e2975fd9 SHA-256: 6b8dfb0c729e28f7a9194c751a7877108a8bc8407c85bd0571b34eedc122491b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which appear to be part of a link farm. A critical heuristic indicates the document attempts to lure the user into copying and pasting content into a command-line context, suggesting an attempt to execute a second-stage payload. The presence of these elements strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://cructi.ru/uplcv?utm_term=minecraft+pocket+edition+old+version PDF link annotation
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/54731106113.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/221586829.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/piwagetaruwuxoz.pdfIn PDF document text
    • https://rajakedua.com/contents/files/jupofenawasojo.pdfIn PDF document text
    • http://metallpress.info/files/xelejoninaziberetuwevu.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210904_5FD844C90A8E24E8.pdfIn PDF document text
    • https://taperagi.com/contents/files/72310419788.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/3977026679.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210902184257397.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/xijexu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8e4tkdc0c06pf397vnouq9omgm/18519521312.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613349364e8fd---xenubifepigavalanogugarap.pdfIn PDF document text
    • http://balone.net/_upload/file///gorutenabobegiri.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/83314137282.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/fibirivajigujebezuferofa.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/xemijokukopiguwijarafewek.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/95445747704.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109062328032904.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210910185253_eGlnYWdlbm9ydXNpYnVy.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/85467309503.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/bezifokujujevukeliwaziri.pdfIn PDF document text
    • http://strandedtattoo.net/file/17440920452.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/32485050565.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/vefidujezovuminatitik.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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 18156 bytes
SHA-256: 5537964c9e331bfd6c5c2b78c298e9e175314ebaacb1c3288ad9b0809079c917
font_01_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 10764 bytes
SHA-256: cbe4fc95ee3b6d1f7d746321484ceb45e44ae5cfe02a0070645b321ac9e6afff