Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1c47b138c418ad…

MALICIOUS

PDF

92.9 KB Created: 2021-09-15 16:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ccc65b7813e46d9a37cad594677be78e SHA-1: fbf5e40a7a1d34bce68898d3a17e5af8709d580d SHA-256: da1c47b138c418ad0f14819ec9bd8e265b41582aea5921bf96068bb3c1024515
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting and containing UTM parameters, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=john+wick+1+full+movie+english PDF link annotation
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613945e3c8609---341874121.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/11457749415.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/65647442237.pdfIn PDF document text
    • http://trevorhannant.com/39248828396.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vonimeb.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/dibupoxumelomolejomum.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/2613788071.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/50453563609.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zazeroxolugijijumamotitur.pdfIn PDF document text
    • https://moolans.com/uploads/files/nenujip.pdfIn PDF document text
    • https://curvy.tw/upload/files/68643145800.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/37001531578.pdfIn PDF document text
    • http://seto.cz/uploads/94237038885.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/97636944390.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/64231880641.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/77440047086.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/robibowegiw.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/wupexekabekejomujaje.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/40838187852.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/94631157817.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/13092615460.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/55602344507.pdfIn macro / runtime command snippet
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5a061dc1018b8600053cead9b1d4f9a9/zizunetuzutizode.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/64636913427.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/91652043892.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/dinose.pdfIn PDF document text
    • https://ctsgroups.asia/In macro / runtime command snippet
    • 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_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 10808 bytes
SHA-256: 3a028fd2f88c43e32e9d30ce221800318760e3256a584e564157e9825862f6cb
font_02_sfnt_off000137b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B5 17988 bytes
SHA-256: 704c8793d0b3788c70ce4fac8c3ed59619754848e329988d0fe6a58e89204b85