Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b923cce44a856e…

MALICIOUS

PDF

74.6 KB Created: 2021-06-01 02:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04cf87b178dda347d38f8b704a293cda SHA-1: 30f1f16cb601546b2d6dbb8d9fa8875c64dd4f23 SHA-256: 19b923cce44a856e4d370aa019485dc5cd669f95a6557a79571e087781e4ed9d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm or SEO spam operation. The embedded URLs likely serve to redirect users to phishing sites or other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://crysiq.ru/pbw?utm_term=reading+passages+for+grade+8+with+questions PDF link annotation
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/85902d4.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/popetogizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_6032bc31742e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5fc9da3fbd47a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_6001e0c5139c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fe4eb27e5f81.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/fewekenes.pdfIn PDF document text
    • https://niwegokizefofiz.weebly.com/uploads/1/3/7/5/137513185/6251097.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/8586508.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/fekut_fefezav.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/meninukojune.pdfIn PDF document text
    • https://biditojutorosas.weebly.com/uploads/1/3/4/6/134657596/zavezeba_kizabekekaloxoj_pogituron.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144433248/hamster_rescue_centers_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faaae35a-c519-438f-9c66-494667e5e55e/hotpoint_gas_stove_igniter.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/59981112681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08205899-9431-476e-849e-7d7b94013630/64564356745.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144431514/nesters_microbiology_a_human_perspective_9th_edition_citation.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/w/file/fetch/144418005/50460047372.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/xozisiperuxutijul.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412281/tamil_old_songs_download_masstamilan_zip_file.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427422/o_poder_est_dentro_de_voc_louise_hay.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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 5688 bytes
SHA-256: 257d6da8b20e3427fe28c605f0d5500444122bb557c053a96bc3f3a48bf2ecd0
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 11032 bytes
SHA-256: b0585f69074e520540a4581fc1dce4db619ee33878f4c6a9f80f931d09b905fe