Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bf6cdd2e1e017a…

MALICIOUS

PDF

71.7 KB Created: 2021-06-01 13:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 314bd30ffa31b8d274455718c7da59c3 SHA-1: f7c5b668ffb12b06710785f41d7004361797062e SHA-256: a5bf6cdd2e1e017a9ec183f5c9687d6b2a29a5fd7a01dd0fd430af5f816ad725
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/pbw?utm_term=chestionare+auto+categoria+b+online+ca+la+sala PDF link annotation
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/4471003.pdfIn PDF document text
    • https://gozerivolese.weebly.com/uploads/1/3/4/2/134265833/5772590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5fee140f7c7ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcca719e76b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_6023e20063f70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosirata.pbworks.com/f/54474208784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2cd475-aa2b-4414-87be-f302fac84162/94408448034.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/baudrillard_simulacra_and_simulation_disneyland.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144419745/87516666761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58453e4f-5b0f-4810-a894-51e0e607aa14/how_to_set_up_lifesource_blood_pressure_monitor.pdfIn PDF document text
    • http://podixarutib.pbworks.com/f/rujogurevalejom.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413496/razonamiento_logico_matematico_santillana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b66ae4-e63a-403e-83c6-648b5b62214c/baby_einstein_jumperoo_recall.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/tijopawanup.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/f/drake_and_josh_go_hollywood_full_movie_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6854cbc8-6f9c-47af-b932-a48bb7feb5a1/what_were_the_causes_of_the_treaty_of_guadalupe_hidalgo.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144456612/citizen_eco-drive_radio_controlled_perpetual_calendar_wr200_manual.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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 5104 bytes
SHA-256: eca72b2ac8e0a0a03794714f88e4652cad0dc76187fb715213db13d7b72e4a46
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10852 bytes
SHA-256: c915a5269700416d7edddf5551d394ac2700a8d47e1038224761ee68b0954be5

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