Malicious PDF — malware analysis report

Static analysis result for SHA-256 23040c4ccdc0e6b0…

MALICIOUS

PDF

82.9 KB Created: 2021-03-05 11:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 72694d08de1311e50e6053b9ccbe3ddd SHA-1: 88ef8495331a157f9cf81cf5d6a0ce321cff4404 SHA-256: 23040c4ccdc0e6b03e19608da18bc74fc8914238ddd81af8258b060d43ba11ca
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable concentration on disposable hosting and link farm patterns, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain keywords related to search results, reinforcing the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=husqvarna+435+carburetor+removal PDF link annotation
    • http://topsale.pro/visababaxutamovupil42pw1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_603c122b93d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fdbcae064eb0.pdfIn PDF document text
    • http://desoneveru.iblogger.org/isquemia_cerebral_transitoria.pdfIn PDF document text
    • http://meetsalle.xyz/38447920838klx6h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_6006f8aba6d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_60182f157758d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_5feaee0deb7a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fe5013200005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5fdf7fabb5ab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_6036134d621ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370080/normal_5fff6dedd1fd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392864/normal_5fc7fb700463e.pdfIn PDF document text
    • http://wisifugapu.22web.org/wegixajewanaxuwutofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_602b335bcec53.pdfIn PDF document text
    • http://moreprodukti.com/15792521116is20h.pdfIn PDF document text
    • http://ukranews.icu/84004855565b70ev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_602552ff6fa7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabinozugi.epizy.com/wupajaxikip.pdfIn PDF document text
    • http://jinibelirakime.rf.gd/nakukosizokude.pdfIn PDF document text
    • http://zokadulozebeza.rf.gd/writing_for_computer_science_zobel.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_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 5608 bytes
SHA-256: adaa7c25e25dda900edb8fdbf5b6c612490dd667826d06d974ae4317e5de9a47
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 11004 bytes
SHA-256: a8031da72928d4367fde2bb0ea8115f7c0687076fe177dcbfaa652813b67ec4f

Open this report in the interactive analyzer, or submit your own file for analysis.