Malicious PDF — malware analysis report

Static analysis result for SHA-256 863bca4014821c1f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-10 05:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54835a3283cf4d10db82622209564654 SHA-1: ddcfefd2b5f37f4df51a3f8383b5db5b57256120 SHA-256: 863bca4014821c1f4df67b851fc318d9d2a8a7199d264b8289fd664f942fa310
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or malware distribution scheme. The PDF structure and embedded URIs suggest an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=fire+7+root PDF link annotation
    • https://kawanmto.info/contents/files/renumoxu.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/vakapi.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/losagazupuwi.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/wegonisumufigakizikalod.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/40305082311.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/41355410594.pdfIn PDF document text
    • https://synersys.fr/contenu/file/50024371086.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/mudotumojumipukabufiz.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/30974195761.pdfIn PDF document text
    • http://taigesw.com/upload/files/73999207811.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/gizunuxejikexizirogamal.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/61131155434.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612efaad18391---45721418376.pdfIn PDF document text
    • https://medius.sk/userfiles/file/lotagevudanijokalurixure.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/bivafabomelunuf.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/vitomegefewilekasa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161385e3589766---86330100053.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/50972633797.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/dukagaba.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/virodego.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simet.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_off0000b98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98B 9648 bytes
SHA-256: 352fe89a04fb853257c37e1a200b4f02bb560b8eea7e371d409187197449e2d4
font_01_sfnt_off0000cea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA2 16256 bytes
SHA-256: 02fb1ed5d312803599f79d466de2ca57b17ed8790a392667816c7faacad79650
font_02_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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