Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f52fe5fd2ae72f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 02:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c8b70120d5aab488401ea0b6c8da313 SHA-1: bc7f64aef252c53ec495912a2cebabcb089a5b85 SHA-256: b7f52fe5fd2ae72f68c92fdaa2dc69e5e8125cfc4d4bb7d358cd4a0458d44adc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://wastran.ru/uplcv?utm_term=candy+crush+mod+apk+unlimited+lives+and+boosters PDF link annotation
    • https://namratalakhotia.com/userfiles/files/lazuwisotiwevuza.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/rilukuji.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/31908411306.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/fexurituvuvo.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/92949886096.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/47984627566.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/jutokapiwirutek.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/50369251300.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/kixesizemubebasowodonerun.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/55635695832.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tedijefagagel.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/69321873228.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/33444639898.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/dibuwewebitawumadoganiki.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/8444324818.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/mipemisasivovami.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6cab538b---pugazuzaxigim.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/44227868447.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/xifonolakobebigajitimur.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/64467890175.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/vutovedejeselelew.pdfIn PDF document text
    • https://ratosatu.com/contents/files/90672103310.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/32224637017.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_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 11324 bytes
SHA-256: e088e9e9ea58ecbfc0e43f33e0d879ddb1509bdb287d6c8f63717bf80b58b1c1
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 17684 bytes
SHA-256: efdcafe05268a8f72c2291ef3ed5e48a146bc7b5a494e55d8f82981d5c5ffdd3
font_02_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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