Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a164324e5b15a31…

MALICIOUS

PDF

74.9 KB Created: 2021-03-18 01:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c845b2c54f1b5f19730026383b2c444b SHA-1: d583e6a3a8ddb5748025c430b924f74a3f1ec110 SHA-256: 3a164324e5b15a31430592c6a070848eeb51e25cec0b0fde39bbc443732f47df
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. Several heuristics indicate this is a malicious SEO link farm, with many links hosted on disposable domains. The ClamAV detection and ML classifier also flag this as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests it is intended to redirect users to malicious or phishing sites, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/wix?keyword=csr+2+apkpure PDF link annotation
    • https://fiwirozubaxezu.weebly.com/uploads/1/3/4/6/134659856/975791.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/cgcQpHE/airport_air_traffic_controller_salary_canada.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/duridagoxil.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/8961067.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/69ed768ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_602017c67fa31.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/4caab16427d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_604cd7e96e708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_60153f0c44522.pdfIn PDF document text
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/denovaliduki_xidir.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/hfqhcja/origami_butterfly_knife_easy.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/xiripozawatirijororeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_60445a28d076b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_600a50acb0e1a.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/9850211.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/mLc7qKi/senorita_camila_cabello_song_lyrics.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/xuregozuwu_lokawajumu_wefutorazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae45ed9-5ffc-4319-bd4d-0d657cd11c26/apc_back-ups_es_750_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17c692d-ad1b-435f-8901-22d3027c2a7c/kedejiwamidelizegololevo.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/is_mechanical_engineering_a_good_major.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a35fa8-6029-4d21-a33f-7e0e0d766ac6/lurorikizosexuferujazixaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34706093-b98d-45d7-bfcd-5c87f893d02a/suvagovazipomugikodipi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 4880 bytes
SHA-256: 85bfcd27d967fefc0c664beb8af0e1d99ae62ef0b63d7e0a52b310d7311ee07d
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 11444 bytes
SHA-256: 809d71db647d0df9b5f54b1722fec5dd6b891b0c64d9329323e420dddeedb3d2