Malicious PDF — malware analysis report

Static analysis result for SHA-256 732a4bedddd1d606…

MALICIOUS

PDF

78.7 KB Created: 2021-03-18 19:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 045b8e1c6bd66c459ab333b0c91288a1 SHA-1: 9d72be3e0d8166b73df7792dbe9af9c8c796ae59 SHA-256: 732a4bedddd1d6068ba1cfb0a0cbb1eccfc8849be8d462116fc7511e90b29a15
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 0.9996

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://botokaw.ru/strik?utm_term=who+was+the+iron+curtain+steelers PDF link annotation
    • https://zolowokixo.weebly.com/uploads/1/3/0/7/130738875/1025637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390663/normal_5fdf87857dd78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd308f4eaa1b.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/3188171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_5fd9164696324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ffc1adc97b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_602afc0219bef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luxelula/biponuxapegudeduxeman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af61c57-23fb-44ed-af19-0712107a73f0/6.0_powerstroke_oil_rail_torque_sequence.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_d86c25335c5c4222809c5426f6dde974.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89a4518-0294-4683-878d-a95e403292a5/who_is_the_most_popular_death_note_character.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/bootstrap_4_ecommerce_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/35015383077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3945166f-ccd1-4e81-85ac-e3bf1e8caa61/rovers_morning_glory_thursday_hook_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ecf4af-bffb-4348-a408-7016525a930b/one_punch_man_training_routine_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0602a5-a6d5-4b62-ab0f-6884ad78f2cd/what_comes_after_grief.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_e939764807d34292b1a46bb9b3c3275d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/553db9b8-b443-4906-8b3d-809e1ac99893/dopitebiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d40dad-e8c9-4929-8c71-eb510dc3b1ff/professional_asp.net_mvc_5_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee27fbf9-6c57-4b5e-88e1-dd07ef336db8/10097879268.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_223b9fb787314118b9cbadd0e37e2de1.pdf?index=trueIn 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_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 4992 bytes
SHA-256: 594fb653485d524c72fca0fc2cdc2ffbe502ac72865109808a84a2e7e82983e1
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10580 bytes
SHA-256: 13482ed5389449a01c6e9c19e70d76a4281109ca74f2adfa2660213a455ce2e3