Malicious PDF — malware analysis report

Static analysis result for SHA-256 59557a37d3f85a7e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-23 06:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 169a703caa246f6ab0808e2d5c6153a0 SHA-1: 33ea53e8fbfe3113815a1afee9545a164d5ae37b SHA-256: 59557a37d3f85a7e242032510c94d2ceed99b76390902ea30abcd67035682462
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 0.9997

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://gimoguvi.ru/award?keyword=somewhere+over+the+rainbow+ukulele+chords+easy+pdf PDF link annotation
    • https://kusugano.weebly.com/uploads/1/3/4/7/134740680/6741663.pdfIn PDF document text
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/7238256.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/65c7a137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_6041771b2e041.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/favevitago-taluwufiwebija-wojewixobil-wutorixebisupi.pdfIn PDF document text
    • http://senteber.site/6324763220010kvp.pdfIn PDF document text
    • http://kernig.online/68084994137egqtt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_6034886f4c9c5.pdfIn PDF document text
    • http://llloooodddd.space/books_in_order_john_grishame7mko.pdfIn PDF document text
    • http://verification-help.com/i_am_not_that_girl_quotes1uwr3.pdfIn PDF document text
    • http://letekidela.iblogger.org/79434874937.pdfIn PDF document text
    • http://znalomstvavip.site/fizerezarokukmc67h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_603ab72bd517d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_60197478e6040.pdfIn PDF document text
    • http://sokolov.fun/vuturajuditexavewefafanvu4j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_600387a0c7192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_2c19baa963a046d2ab218365831259d6.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_7592cfef4d9347cfa578b77fa34e1140.pdf?index=trueIn PDF document text
    • http://lodavudomajip.epizy.com/kkhsou_deled_result_2018_marksheet.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_75a63adae02d4700980b8daa9bfa40ba.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
    • 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_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 5956 bytes
SHA-256: 3d39e0a10f41dc189952c3b7753bff49d46b6b0c72262281c793c271be51089b
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 10848 bytes
SHA-256: b7d77ae0c48b8bd68eea9ff10db4a08913b590094dc7847c5de2de9b5a6b93dd
font_02_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67