Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e4a65aeb481854…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 19:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 2e1448de99753215dfabdf7bf2144a47 SHA-1: 7a171accee28f0290bf89f97927fd3772ec0ec41 SHA-256: 16e4a65aeb481854b64a2046be4891f738f6f6ec69a0af0364970b84c883c931
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://tinnituskozpont.hu/files/fivapumeku.pdf In PDF document text
    • http://pwr-tech.ru/userfiles/file/saduz.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/padikoninu.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/monavidu.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/webusadimofeviponebixel.pdfIn PDF document text
    • http://actinq.nl/upload/file/vogedanelifefovejed.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/36798848068.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/48361394986.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/tifanavefefunuselub.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/69586379826.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/25854690966.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/89087131653.pdfIn PDF document text
    • https://chp-travel.ir/data/file/matubojeli.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/62370685217.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/gitijirazepanefudasu.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/69977758899.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/32421745634.pdfIn PDF document text
    • https://lapakunited.com/contents/files/19886836256.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/jinovibo.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/nosegalami.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/59527288806.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/10016388636.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/25557802176.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zizerutelajije.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sagamolizefefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=episiotomia+musculos+pdfPDF 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_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 18104 bytes
SHA-256: f53d88c41c247a61069a28fd02a497347f66f0e08ae31b73b83fad066d52bf03
font_01_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0B 10528 bytes
SHA-256: 5737a9299de6ab2dc0c007cb0f0e02ca211c60de9be58fa4652f0d459e68a657