Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7e1e76826fde17…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 15:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d7249678e929790ba32e062ccf7c049 SHA-1: a7c5b8f83875aea2af7f681518adbfd9812baf3b SHA-256: 8b7e1e76826fde17de3b8d0823152c8fb81ddb5779b99817695ab3486e91163a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV specifically identifying it as a phishing trojan. The PDF contains an embedded JavaScript stream and numerous external URIs, many hosted on disposable domains, suggesting an attempt to lure users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing pretext by indicating a large number of links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=calorie+counter+for+android PDF link annotation
    • https://wonwon.taipei/photo/file/76115649328.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sizesorenexejumakopavonu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/31129398811.pdfIn PDF document text
    • http://meditopthailand.com/file/32988889378.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/temebenabejujofixejote.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/xawero.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pinobemiworusakewofigosap.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/kejifimikuzalofibe.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/64478773431.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/losapelifipajodadum.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/83340520860.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/77282298007.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0f1025b1---12933446515.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/luxep.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/zedej.pdfIn PDF document text
    • http://zzquansu.cn/d/files/55655943912.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109021525236237.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/10461163365.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/nezifakuwivejokifubinosoz.pdfIn PDF document text
    • http://liluby.com/upload/file/seguwofo.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/jamatiletuxaju.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/gomaf.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_off0000b89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 16832 bytes
SHA-256: 88e170f3189a7fff48229c5cdbf697d51e58975bdaf94026c49fcde7039c39aa
font_02_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 10432 bytes
SHA-256: 94e1cdc82c46a9605e6fb4f6cdd1dde47d775180a635613ee0df30c2ef134d72

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