Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc2e4d09dabd37f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 09:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fec684408c3379c4776c18fd370686fd SHA-1: b6a0f14d45781bee308830265b0d81857f619a0c SHA-256: 5fc2e4d09dabd37f2b1c5be6cb50a2f3cb53bad62e4b40d9345a906e56828865
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one disguised as a Chrome setup download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=chrome+setup+for+windows+10 PDF link annotation
    • https://dnm.tw/uploads/files/202109200011495802.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/26328555385.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/13881052787.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/71446162152.pdfIn PDF document text
    • http://gdgom.com/upload/file/210903235807487161g63b538solk9.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kewatefulidonuninerubo.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/fazovefe.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/66739296246.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/25757609149.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/fifaludofikutud.pdfIn PDF document text
    • http://npas.ru/pic/file/31701628327.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/81200765399.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/50847214015.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/60583943287.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/sipaxapagetigo.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/bazepotule.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f29597e6c---77568590978.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/8683481322.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210920100654.pdfIn PDF document text
    • https://denimder.org/resimler/files/jibisagodufisodutatejid.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/66828815173.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/negojobidugixo.pdfIn PDF document text
    • 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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 10944 bytes
SHA-256: f490807457fe9bf40677fdd108daf474d4ae4818c4a7e390369eaed46e39d5ba
font_01_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 18128 bytes
SHA-256: cb104916b7572b2425bb5390971c5fc589626a2a37ccaf16263fd8eab9f2a05a
font_02_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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