Malicious PDF — malware analysis report

Static analysis result for SHA-256 809f9d53619d0a31…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 21:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b829168aae2f9952567cc25d078a05fa SHA-1: 0330dbc8a365942d5befaebcff5ded4fc91a4345 SHA-256: 809f9d53619d0a31ea8901e7b71df52ecb2ee9d809bb5564328c8b433331c962
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation, suggesting a link farm or phishing infrastructure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination or distribute malicious links. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://jjkxmy.com/upload/files/202109111934462801.pdf In PDF document text
    • https://lean-ds.com/upload/editor/file/gizarisikudebukitoxana.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/20421351313.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/gezujuwosarivoxeb.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ridexijurowo.pdfIn PDF document text
    • https://revive.fashion/upload/files/fubilolabafetunoki.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wimuwefuku.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffa2adbc20---jowipakufagijuwibisobomox.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/29363639935.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab0c2d001---6988951236.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/gomevo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/45392411406.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906110729.pdfIn PDF document text
    • http://greenglobepms.com/uploads/92704674244.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090109594335.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/72933406430.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/xuwufagifum.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/11909783473.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/jujukiritasukew.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/manevizumelipufosogin.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/58681168409.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/89902637268.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///sokuzixusadupajuruto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=live+wallpaper+fatePDF link annotation
    • 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_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 17288 bytes
SHA-256: 4abfa2e8aec8417df4a5c0af3397d86d4d7f9efdeb931e50da64b20fd3a556ce
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 10068 bytes
SHA-256: c472272b25f060923f04b2b2ba5788b47a9fa51cf14d68f36521a53abee6db87