Malicious PDF — malware analysis report

Static analysis result for SHA-256 170d0b9546a7ab83…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 17:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8dfa0410210d1c44a68d186926c83e1e SHA-1: 9b4932fce09529047e2d4bb430cb4689cebf88b8 SHA-256: 170d0b9546a7ab8361942e76a54d42297654c6d6de0751cf02ddd46e48796d82
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious phishing domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/wix?keyword=culinary+arts+2+final+exam+study+guide PDF link annotation
    • http://lejesuxesegofaf.22web.org/java_8_tutorial_point.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd9d86aa25db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_5fd77b4b14d4e.pdfIn PDF document text
    • http://lapivezog.22web.org/livodexafadejota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ae50ae-fe7d-43a6-b4d1-ccc38f08aa79/what_is_double_protein_in_subway.pdfIn PDF document text
    • http://famifel.rf.gd/examkrackers_mcat_9th_edition.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_98637c0f04ec4a3aacb6c4b7cff2c3fd.pdf?index=trueIn PDF document text
    • http://nifiloxoburufi.rf.gd/equations_of_lines_worksheet_gina_wilson.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_ca33aacf3d4c4c1bb70546587e5733ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midipes/checklist_template_for_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/85139922766.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/lalidebud.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_ce11a977abf04c539c66ab1b9d35ae5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/35510781349.pdfIn PDF document text
    • http://nisoruv.rf.gd/new_yorker_cartoons_explained.pdfIn PDF document text
    • http://toxuxefegetej.rf.gd/antonio_vivaldi_gloria.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/1134731713.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_2d2911bb14e24750a5eddb3795eebb09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/sperm_analysis_test_report_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db2f74c-636c-4af2-afea-792bb62c06b1/what_is_the_use_of_wsdl_in_web_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db52eec-fbdb-4316-953d-d3fb14e9cdc8/css_the_missing_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205c4bdd-6934-42b6-b5d7-5f1d00a98131/20599495487.pdfIn PDF document text
    • http://limuboru.epizy.com/xedoxubutumiritip.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_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 5436 bytes
SHA-256: 1d4f1678db9abe96f7e024c2a1d0a4e788dc3e736673fbb699e2700b903acf4c
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10420 bytes
SHA-256: 1a9d973a2dcd9dad5a0224086b325e54d93b5d173a16f874276a6bd52cb44e50

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