Malicious PDF — malware analysis report

Static analysis result for SHA-256 63196f3bca920f1b…

MALICIOUS

PDF

70.0 KB Created: 2021-06-10 17:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 63f74641a568d42169c4c06857634183 SHA-1: ae0161ce9778cd16c6135d94908fbde67a25cf94 SHA-256: 63196f3bca920f1b3593918385a0a20dd220378bf971b22bdbea1869eca19da0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URL points to a domain that is likely malicious and associated with phishing attempts. While no scripts were explicitly extracted, the PDF structure and external URL suggest an attempt to redirect the user to a malicious site, consistent with spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/pbw?utm_term=class+11+computer+science+python+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5fe0a211a454b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455645/normal_604fdd02745c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_6026c4cdcad96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5fcecb3673486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debitagemi.pbworks.com/w/file/fetch/144898713/laptop_battery_time_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d60eba0-295f-45f8-a35f-46b3b4d1e6c4/how_to_apply_for_a_job_at_the_post_office.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144523356/how_much_salary_does_nigerian_army_dssc_earn_monthly.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/sap_data_services_4.2_technical_manual.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144771999/64576947855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef0b6c7-58e0-44f8-a9ae-4613bfea16c7/how_to_write_a_conclusion_for_an_opinion_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7df89f7-1c69-4b4e-99e6-dee94da8a384/the_maze_runner_2_free_full_movie.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/w/file/fetch/144612453/motor_learning_principles_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4224700a-ba19-4461-b5b9-65bc93f008d4/1998_honda_accord_owners_manual.pdfIn PDF document text
    • http://wetavun.pbworks.com/f/bamaxosazan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd6e435-d096-4869-ae75-8341cc1ac3f8/25326150094.pdfIn PDF document text
    • http://serawazeg.pbworks.com/f/avengers_age_of_ultron_full_movie_in_tamil_720p.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_off0000d38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 5656 bytes
SHA-256: b88d891bd36588e1e681145ac3cbc4e7ec24108d2bb7c282bc4011db938a2c57
font_01_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 10720 bytes
SHA-256: 7061a887da0c5aa23018cf658d540bb40b30b9935cd0ea932815223b70465faa

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