Malicious PDF — malware analysis report

Static analysis result for SHA-256 849f26d5918a0800…

MALICIOUS

PDF

74.6 KB Created: 2021-06-01 13:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e941aeada158a7ee7abfb157f967c334 SHA-1: eeb7c98b199440b8b4480d9c292f557cad56f631 SHA-256: 849f26d5918a080012a59513964a086558cdb1f333abcf49392af2cd6ddd73ac
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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://queure.ru/pbw?utm_term=how+to+choose+zojirushi+rice+cooker, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/pbw?utm_term=how+to+choose+zojirushi+rice+cooker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fe30b76765cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_6042cbe9b2c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_6037de4da9a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_60323a0484aed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369932/normal_5ff71913bb0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_604a149491249.pdfIn PDF document text
    • https://vovalupegat.weebly.com/uploads/1/3/4/6/134632914/9495079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5feb193d60187.pdfIn PDF document text
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/2965040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_606689456554f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144447237/mclean_borderline_personality_disorder.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427467/why_is_ophelia_upset_in_act_2_scene_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd81c50-3d68-442f-bf52-c8b69f978fc3/lamerivuromamapavirijipar.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/foods_to_eat_for_acid_reflux_relief.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144426198/24238008957.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/how_much_does_a_minky_couture_blanket_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886a424f-fbaa-4e05-a9f8-bc9816ba900f/75153486559.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/supagoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec68039-b3d3-4461-98a5-407f6898d453/what_is_the_oxidation_number_of_hg_in_iodide_of_millons_base.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/what_does_the_triangle_symbol_mean_on_dashboard.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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 4888 bytes
SHA-256: 6a4556460ba82f0025675aa5c257240c60fa71b066b0c37c631fc1c4fc227393
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10696 bytes
SHA-256: 3fbb860272f9525e94f8771254eaa29daf407124fd0b4d7e089e2fd910446ebb

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