Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c990f22697b99bc…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 21:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75bb3a87a3b53b66265f4253bd47dc15 SHA-1: 75daf63a41e972e770a3a34ded580ca626e20098 SHA-256: 8c990f22697b99bc8fb087687eb3f7f525c6c0935f8ee27a310b493cf24625dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crewmak.ru/uplcv?utm_term=app+for+watching+football+on+android PDF link annotation
    • http://jubangh.com/Upload/FckUpload/20210914file///loninozafiketuwuj.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/74588784666.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/xunanalazizivokexigukamo.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/sixavasujutoxa.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/towugogo.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/553478665.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/4602013965.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/6870250535.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131859b9ee0a---29825982518.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908171735.pdfIn PDF document text
    • http://d-innovation.com/upload/files/52613074862.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/danawinufururetuk.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/82531557739.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/dakatiwajim.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/magigivazowiki.pdfIn PDF document text
    • https://doitoutdoorz.com/file/wINq5SzAet2lMiGV.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb2eb4570---20870946046.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/10263439856.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/59628173230.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/dijasodorumoponerabumal.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nixufamonotikekafadegojoj.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/12253668461.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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 17640 bytes
SHA-256: 12bde04aa4b7ebf9b5753a3a4907600bd95716d59ab99cd944b6a6a4e6995520
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 10808 bytes
SHA-256: b8c0995b3e7b6da885a918d18851885bce7ed3dcc329e8c3e4b2c61037dbc63f

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