Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6072bf6d6a7ae9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 19:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b550e8c35c2a5b30d7a9573a0a0a155 SHA-1: cbf86dcc8c1890859c7b9e5eced7af901b231f7e SHA-256: 8d6072bf6d6a7ae9a21ae238f8d618efa6a0e990634cb87c2bc24e3a0b424c79
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and employs lures to trick users into enabling macros or installing remote support tools. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lures suggest an intent to download and execute a secondary payload, likely exploiting client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://burlingame.com/wysiwygfiles/file/19562540356.pdf In PDF document text
    • http://strandedtattoo.net/file/rariwalowinimeki.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vimonaruzuwef.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/55435689551.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/6034054823.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/bixazetuganolobunatu.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/9590024252.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/65079600403.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/girufowofu.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/jeforilogerulobujuwul.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/dukedajizegojefozotu.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/lodox.pdfIn PDF document text
    • https://amgaa.org/temp/files/20157636825.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/lufajakojuxozatalemifi.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/75327730545.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/xizatolemo.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-8/20210908101558882075.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/rajirumesasu.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/60614741931.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a87a47f628---jonabinulin.pdfIn PDF document text
    • http://fruitsad.pl/images/file/rabiwipajoxuji.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/zurupetizetixakifed.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/86671029550.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/danumitiweluduk.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zakaret.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210903073756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wendler+log+531+pro+apkPDF 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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 18228 bytes
SHA-256: de4a49a4bc41e617901c5e9c1bd2f47a3f0d3eb663fbc6f62a67899717bcea88
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 10652 bytes
SHA-256: 9de6933ac3f06accdfe5ede94a93a14fc6e8e720999a1e6735ad58a220de0fbc
font_02_sfnt_off00012210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1