Malicious PDF — malware analysis report

Static analysis result for SHA-256 2780c5b8442904f3…

MALICIOUS

PDF

68.9 KB Created: 2021-02-19 16:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7a4e8dc6434610ee6c292727224d2912 SHA-1: 2cfc162a068f599c74e970ed5681ed5bf530d406 SHA-256: 2780c5b8442904f3217b09ceeef774bfc8482a2fbb69ab6c9e3c6e1f4640158a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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/123?utm_term=2012+hyundai+sonata+headlight+bulb+type PDF link annotation
    • https://cdn.sqhk.co/daxerarugak/jfhcssg/91493276005.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/geKY1id/motorcycle_wallpaper_for_iphone_6s.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/grAjjOU/waninu.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/1Obypge/niradowa.pdfIn PDF document text
    • https://cdn.sqhk.co/pakelabete/LjjWidt/bowling_tips_for_beginners_cricket.pdfIn PDF document text
    • http://sefobadivura.iblogger.org/kakenilaxev.pdfIn PDF document text
    • http://skidki-day.store/pedavukvt6nt.pdfIn PDF document text
    • http://cardio-active.site/edelweiss_guitar_chordsv9idx.pdfIn PDF document text
    • http://eroganoficial.site/bahishti_zewar_in_roman_englishpd7pu.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/36526154066.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/fjfMcjh/craigslist_furniture_for_sale_springfield_il.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/jjgRAhj/bulujuzerapojibejitu.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/Gq8jcij/bubble_tea_house_roseburg_or.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/hgjbCgi/lirakixezimelupozalexogu.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/dojonuta/sipegiwusinafa.pdfIn PDF document text
    • http://xabofaveretezu.rf.gd/dallas_cowboys_cheerleaders_uniform_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/14477335750.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/tavivutivekeditusamu.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_off0000cd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 5596 bytes
SHA-256: 712cdd90376933f74ee89a5d154ad6ff23cc225a36fb618c357221f2b8626bdc
font_01_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 11928 bytes
SHA-256: 6941655560d3431fbf1f6a284cba1d0adcd256dad80acbb2ff01c8ee80119c76

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