Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbeb7008cd64f61c…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 17:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a7e839cc24e9c41c65d768a9371eef1 SHA-1: 11d560b57bcab3f70a26ea26e09fa5b64678aa36 SHA-256: fbeb7008cd64f61c18f13148eab5f921c3d7980c40f48e52f00f39d23c5275dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to potentially compromised or disposable domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is part of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143e91d41f01---90650377925.pdf In PDF document text
    • https://cingenito.ca/upload/editor/file/64779899671.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/butivepaxabo.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/zuwexujudid.pdfIn PDF document text
    • http://gibisch.biz/files/files/18782826629.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xidanujizav.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/31045742040.pdfIn PDF document text
    • https://andrejc.si/files/file/78654983425.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/89094203469.pdfIn PDF document text
    • http://qdjshg.com/files/file/luritidosubidizuzipatubu.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/56095457136.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/janusupu.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/8074970448.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/50267213382.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/xopoxavene.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/binexixositefodawa.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/nanabosuro.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/58511369368.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161429e9742500---55858194006.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/49769898074.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/mutiv.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/61632278956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+keep+video+as+wallpaper+in+androidPDF 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_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 17432 bytes
SHA-256: f0ea0f20faf1c79b9d20c6df283ea2b3f5cde4c9f8b55aebbef09968ac9545da
font_02_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 10620 bytes
SHA-256: e78a2cf69b950e6f8688072faec3ee22782fae70f980ad908ca5a3a75c653385

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