Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7adcf15b374139…

MALICIOUS

PDF

75.3 KB Created: 2021-02-24 16:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1bca3b00f7b2369ec5d39e285cc665e0 SHA-1: 9e7265fc2458169f3ce42ecd90010d960871ad45 SHA-256: 2a7adcf15b3741393e63ad823da7fd03b638ca4779daacb34d069fdf6f7687f5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('seumenha.ru') that appears to be part of a link farm designed to redirect users. The PDF's structure and the presence of external URIs suggest it's intended to trick users into visiting malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=master+forge+electric+smoker+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457563/normal_603239d33e1ee.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/fluke_networks_pro3000_probe_user_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5ff98f0c943c0.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/kakorivubefebok.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/zotojedas.pdfIn PDF document text
    • http://laxuribotu.iblogger.org/malikipuram_weather_report_today.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/propiedades_fisicas_y_mecanicas_de_los_materiales_de_construccion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fe15372a2956.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389601/normal_5febc2c9b864b.pdfIn PDF document text
    • http://dafusunefu.iblogger.org/intravenous_fluid_therapy_nice_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_601aa49f68b1c.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/tajimipojimo/28323326122.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/mejedakabotidano.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/74800349131.pdfIn PDF document text
    • http://vudebedof.rf.gd/jazezevuvene.pdfIn PDF document text
    • http://wotonopeg.epizy.com/valvoline_power_steering_fluid_application_guide.pdfIn PDF document text
    • http://pamilov.epizy.com/dyspepsia_guidelines_2019.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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 5268 bytes
SHA-256: cdcb0f9ee6243efce3219041c796531c89162fb9e04d4b6f95d423efdb526a1f
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 11240 bytes
SHA-256: 0b74b12a4c1fec5fd93cd65517552673931dc1bbc38de2dc64c9488a9b1053b2

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