Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26eb080653d4879…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 04:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0424b1e0d3dc2abe7388786742e240b SHA-1: a389666b1751ae233c79a5505b22b7802f621cd4 SHA-256: f26eb080653d4879051b2230c7f41e473d85c27909cce8024a9a7a341cc7f387
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The presence of numerous external URIs, many pointing to disposable domains and structured as a link farm, suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://big-blue-bus.com/pics/fotos/1/file/68880830920.pdf In PDF document text
    • http://jjc-dev.com/userfiles/file/35628998898.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/fatupakan.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210905045530406019gcyzm.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/potomat.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/doxazetiludukekanero.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/44596542852.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7566182c19369c9f4d57f8056797c7bf/59353503005.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/wujamelalatudogusemon.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/74935777683.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/dilefaposimazem.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/76360283494.pdfIn PDF document text
    • https://kiptep.ru/file/22760339443.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/xupovanopugokixesuwom.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/85205062356.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/38912143968.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/23352449411.pdfIn PDF document text
    • http://dejede.com/userfiles/file/78165199480.pdfIn PDF document text
    • https://upaspor.com/resimler/files/rukuporuxemipori.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/tonuvarimujajij.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/gutoborafudawazavamobaf.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3fca6934---8017296033.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/43806474414.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/bezamegupimefimiwusorotop.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/tewetufuzomubebuzukolifa.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/74167416079.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/12297627674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=deus+ex+the+fall+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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 14568 bytes
SHA-256: 3cb50300d6ad9980d9f7a51430c32f5c423cd61ad679777f6f30acd4519d1572
font_02_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10336 bytes
SHA-256: 6438179cf9dadb0a9b89c30c1f1ae79c22e3d8700e15ea18184abdb879ce5ffd