Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a17f1a34ca0a2b…

MALICIOUS

PDF

81.8 KB Created: 2021-06-07 13:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3fd330e053d2f4b5c69fa3fde8dbc2db SHA-1: 3c78b7281c906e4bb799fe7ae2e17f6a51d67469 SHA-256: 26a17f1a34ca0a2bc909f07f34977c2361a675bc1f9136387299cb86035d8f05
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 SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

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://cructi.ru/pbw?utm_term=how+to+spot+a+double+dapple+dachshund PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494661/normal_602a5011e4707.pdfIn PDF document text
    • https://kodowororebuvos.weebly.com/uploads/1/3/5/3/135392879/mowoxenimufeli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_60bb5771af842.pdfIn PDF document text
    • https://xitipirobopu.weebly.com/uploads/1/3/0/8/130813988/kofevejewa-daxufogabogela-dutawosoxazem.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/xolabijud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5fd6f0d85dd8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_6041e0a542eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_6049eb31d952c.pdfIn PDF document text
    • https://kafutejitiripil.weebly.com/uploads/1/3/4/6/134625984/e73136b643496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_60361381d41ad.pdfIn PDF document text
    • https://jawokisejul.weebly.com/uploads/1/3/4/6/134601468/baxoguwezadut_pobolefi_figekidege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_6056475e65892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/f/41787998606.pdfIn PDF document text
    • http://metudebebi.pbworks.com/w/file/fetch/144659220/aashto_a_3_soil_classification.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/w/file/fetch/144464970/what_is_a_daily_report_sheet.pdfIn PDF document text
    • http://jutopar.pbworks.com/f/xemavamegivi.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/campbells_core_orthopaedic_procedures_free_download.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/85174768718.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144559797/5764665670.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144634896/informacion_del_acueducto_romano.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/jurivibafevagujugut.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 5256 bytes
SHA-256: db1bfcbd5b9e42ba93bb08f34494c7c844f647c637e78852624dce5867a211cb
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 10948 bytes
SHA-256: 190afa5e9e3183f4a5d5d8f00e58c7d9ee290b2f011db045ba70985622cb1735
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7