Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f7d54f45dc5361…

MALICIOUS

PDF

89.5 KB Created: 2021-02-10 09:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: afc459d2fb092c0c535d4a65885f4f36 SHA-1: 32cf2f9b93777673231961e587d2a6e2e547a8fb SHA-256: a5f7d54f45dc5361a342769377dc6b3d2e1ecc6056f5e56a587e2ae9367cc6b8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/aws?utm_term=compare+and+contrast+worksheets+grade+1 PDF link annotation
    • https://gulikefesagigal.weebly.com/uploads/1/3/5/3/135303577/boriresawirebonuro.pdfIn PDF document text
    • http://healthit.space/aditya_hridaya_stotram_sanskrituk09o.pdfIn PDF document text
    • http://brumbum6.xyz/driving_school_2018_gameplay1u8o6.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/2161785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427094/normal_5fecd0521d444.pdfIn PDF document text
    • http://leopolds.space/tenetim69v0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fd11cdea1293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5fc9b0b22e85f.pdfIn PDF document text
    • http://curvepreloved.com/kiziwovula35bpv.pdfIn PDF document text
    • http://site-shop.xyz/25665550364fsqb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5feb801e7fc5c.pdfIn PDF document text
    • http://card2card-perevod24.site/ganumujupiku55tq4.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/ae2c2cc.pdfIn PDF document text
    • http://ctyr.ru/abolishing_performance_appraisalsjjtw1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394072/normal_5fff750bbf17c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_601e706aca42f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/beyonce_formation_super_bowl_costume.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/assistive_touch_pro_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/vifimixupa.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/china_asset_management_industry_report.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 5424 bytes
SHA-256: cbe3fa01fa3f77e88ed5f8f07dfa62f354209aa394e38977b1c6b757289b9b26
font_01_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 10912 bytes
SHA-256: 982eec87b30cea1e06f7338f3329f80ddcd1609dece0afb05f0c1d05a8ec8774
font_02_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00014985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14985 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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