Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9d52856924c767…

MALICIOUS

PDF

64.8 KB Created: 2021-02-12 22:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f16a8d3d92ff0d083b6991d39174fa63 SHA-1: 34c90e489bff7e8a7f6afc5f1e91c934df4843b5 SHA-256: da9d52856924c767f948cfe858365945fe5a5fd8bf1522f008c8338aabee6681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or SEO poisoning attempt. The primary URL, 'https://seumenha.ru/wix?keyword=toboggan+for+sale+sydney', suggests a lure to attract users searching for specific items. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=toboggan+for+sale+sydney
    • https://cdn.sqhk.co/fasaparoba/Jhghjjd/61610274828.pdf
    • https://cdn.sqhk.co/padasagam/AYjihgB/xogovadokulakij.pdf
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/681a07e5f85a.pdf
    • http://hhizmet.com/valores_para_el_ejercicio_profesional_juan_gerardo_garza_trevior315a.pdf
    • http://olipaka.xyz/cheats_for_gta_vice_cityebhy4.pdf
    • https://teribizekejuxes.weebly.com/uploads/1/3/5/3/135391999/1155103.pdf
    • https://cdn.sqhk.co/nuroteditu/nhdjjhh/fasomuvevedebebugox.pdf
    • http://datingdate.site/46597112942zkmji.pdf
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/jepusi_suwupesarigoka.pdf
    • https://genexezo.weebly.com/uploads/1/3/4/6/134616565/900680.pdf
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/a3986b282.pdf
    • https://cdn.sqhk.co/wowasuperan/Wjbhap2/prisma_photo_editor_for_mac.pdf
    • http://small-italy.space/91506317825toxse.pdf
    • http://muzhskoizhurnal.ru/gosurosamuvulajibkvbv2.pdf
    • http://magic-spring.com/xutavugd2vj.pdf
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/wenijisa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paropabaru/tolunasadidonas.pdf
    • https://s3.amazonaws.com/lawakux/captain_tsubasa_game_for_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c03d.bin
b714cfa67c7ed2140c2c2fe2ba02e6da2161d29537e6bdf9adc4bd748e6ccb76
pdf-font-stream PDF embedded font (sfnt) at offset 0xC03D 5264 bytes
font_01_sfnt_off0000d23c.bin
e6771eb16bcd0204b995b9e2f74394e841f43ebf54af7f72d1624de2b5e0c6a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 10612 bytes