Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd37004ca2bd8877…

MALICIOUS

PDF

83.0 KB Created: 2021-03-25 07:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 661dca32f652951650de03eedc9ce5c1 SHA-1: c6165a4a727be8fad8fe04504856524eaab771c7 SHA-256: cd37004ca2bd88773eb54e34d668dbc54b8833936183ff65ef8b4d7c9d5c899e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/strik?utm_term=what+are+the+108+tai+chi+moves PDF link annotation
    • https://kunajulitamajel.weebly.com/uploads/1/3/4/5/134530001/8118047.pdfIn PDF document text
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/gapovi.pdfIn PDF document text
    • https://cdn.sqhk.co/domanolorup/zzBhezw/vcomp110._dll_sony_vegas.pdfIn PDF document text
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/4573450.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/genetica_humana_libro.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/941481.pdfIn PDF document text
    • https://zejabiforisog.weebly.com/uploads/1/3/4/2/134266870/zodekemivevaz_baduwo.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/gjIX4G7/pififu.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/eroso_e_assoreamento.pdfIn PDF document text
    • https://jonimewogil.weebly.com/uploads/1/3/1/8/131860125/riziwaxebarole.pdfIn PDF document text
    • https://natozimokuwepef.weebly.com/uploads/1/3/4/3/134398015/6433735.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/6765643.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/a9c629.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/nilememutebelopo.pdfIn PDF document text
    • https://ruvedusipokowu.weebly.com/uploads/1/3/0/8/130813644/dajilirujavami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitirew/xebodakatovuzojiwejo.pdfIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/amgdalas_cerebrales.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/calculator_apk_app.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/motorola_cp200xls_range.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/71030682051.pdfIn PDF document text
    • http://kususen.myartsonline.com/auditing_and_assurance_services_international_edition.pdfIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/asterix_and_obelix_comics_in_bengali_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 5300 bytes
SHA-256: 189478bca0cc0f676025e3fa10f26e9f38839b2c12ee4e3d02704837b882a6ae
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 5468 bytes
SHA-256: bbc39ceb7d741e3edde979b551cb1bde7ef45bc8adccdafb961e774f0ea781ed
font_02_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 11908 bytes
SHA-256: 262f05753f405e0e18faf277f8aac5febcfda98519cf171175509ac92e5efeff