Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a5c1cf29c8a270…

MALICIOUS

PDF

81.2 KB Created: 2021-03-07 17:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 59d7ad57e90fe0b1f52f4f0f5146d1f4 SHA-1: 9287e16798c64141ed96114167a338b6baa2fc4f SHA-256: 86a5c1cf29c8a270da6e78ce883914138a5b74ad29e7230181f98f41d090a679
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 0.9994

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://lozipotod.ru/strik?utm_term=victory+cross+country+service+manual PDF link annotation
    • http://tobowajoveza.iblogger.org/vatinovubiwafuwukavepaja.pdfIn PDF document text
    • http://jotaxanalesuti.iblogger.org/jikokosokapo.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/vexeliku/faded_instrumental_piano_sheet_music.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_d2ef704b63fe4ef98857f8ac021781db.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_abaf14c60a514dc3b47704e9b2265770.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_b605edb5ec254a469444975a8e989e3c.pdf?index=trueIn PDF document text
    • http://zabukek.rf.gd/59458193629.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_802846b29e9c4022a3e4a0cb795048d2.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_e05affad056f4c12abcd94eeed2aa1c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/60326500765.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_091ff3677c7d413295a07cc71d777e37.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_d0eef359fbcc4e9b80ae38f275f018b5.pdf?index=trueIn PDF document text
    • http://mafifupep.epizy.com/44604490723.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/b_pharmacy_admission_form_date.pdfIn PDF document text
    • http://walogoke.epizy.com/california_ag_sales_tax_exemption_form.pdfIn PDF document text
    • http://kaderuzaxaje.rf.gd/79713598792.pdfIn PDF document text
    • http://gubuker.epizy.com/how_to_use_multimeter_to_check_continuity.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/zabodarolomadubufe.pdfIn PDF document text
    • http://widurema.epizy.com/zizawipovuludalipajada.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_6228d1270c11403385f5d920b8fe5890.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/affichage_barre_formule_excel.pdfIn PDF document text
    • http://garuzamu.rf.gd/voxubuxomojeramodobegalel.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_57166a54419f42969bbca1dc6575dfff.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_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 5072 bytes
SHA-256: b1b6b6407b897136706488d3d158da48e7b0858692c3b9f97ac51514b1aed5d6
font_01_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 11576 bytes
SHA-256: dc8d35d951d0d16cef3ddd2cdaaf09dc2b8777c142f543e0f8b720681cc0db7d