Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f72968891be1443…

MALICIOUS

PDF

83.1 KB Created: 2021-05-30 17:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8c250087686ced8a4520cf1f6f46441b SHA-1: 2159a364a9458aa8f3c6d3ac6d77a99ad8e28142 SHA-256: 2f72968891be1443dd965b2bb8d430721a5a34a0d83ffd736e547595e60b3d61
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=the+game+penetrating+the+secret+society+of+pickup+artists+ebook+free PDF link annotation
    • https://kuxozofaxaxasij.weebly.com/uploads/1/3/5/3/135325708/duwiguvunofumu.pdfIn PDF document text
    • https://mixajogidevo.weebly.com/uploads/1/3/0/9/130969427/rozijikop_nuwabuxamulod.pdfIn PDF document text
    • https://relotozaku.weebly.com/uploads/1/3/4/2/134266658/dc462d63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5ff23fbc45085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_6038ec26bd6c9.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/4350698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_60491b24aee38.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/suwek_niseranawodas_rupuzulotatukog.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/d3c754b528.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/b9cc1ab6-5ee8-4e96-bf0a-5efbeb1450fd/forgotten_realms_campaign_setting_3.5_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304d128a-e2d3-4336-82a0-21d70b30117f/how_to_improve_your_bad_handwriting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7477dd1-7548-4a72-895f-506cbf2ef814/72674159507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a732347c-ff03-4533-a0c0-b8d5e42046c5/36045680597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d0fe02-efac-423e-b7af-ef30c4623da8/1607680694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783cccb3-f4b6-4e43-9842-8098e2a220c4/python_convert_for_loop_to_list_comprehension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28be6892-d4ca-4a6b-96e9-7e8085cb86a9/what_is_the_formula_for_velocity_using_acceleration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62dc385c-247c-41ad-9b96-a0a69dd6d3d3/what_is_ap_studio_art_2d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63527bc3-26bf-4d35-861d-e645e663b886/65294605906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677abde7-0b8a-4551-9e18-7b54c705fb38/how_to_eliminate_stress_in_your_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ae46d1-b5df-4399-9b1c-02f08c376dda/examen_diagnostico_de_geografia_para_bachillerato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26d663e-8dc3-40d8-a6b8-807e58f9244b/nedugimazalirunovep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2474e167-b499-4393-a45b-a7b6f48efd0c/87847903638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca50404c-8b80-4331-a1da-80dc05a59091/69684796641.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_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 5652 bytes
SHA-256: 8b5997d03863eae530f12ecfa33f4c5a1a709e4247a6b21ea61d8840f6f18102
font_01_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 11196 bytes
SHA-256: 19b53385d2cb1b88ec733e9dda5cacce9cda64689a58b463c91c3ced25101d46