Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a6ca0c69995090…

MALICIOUS

PDF

87.9 KB Created: 2021-03-18 21:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ca4a66ee8282bb6fa5427a83e791c47b SHA-1: 97143ee0bbc19f7a378b83a81d3a252771f1b231 SHA-256: b8a6ca0c6999509056bc7490c6843afe9ab8dd422400302b765daea08a920ed7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs designed to redirect users to other sites, potentially for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to lure users to external, possibly compromised, resources.

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://leonvi.ru/wix?keyword=swtor+sage+telekinetics+6.0+pvp PDF link annotation
    • http://marketitaly.info/ludazonumuvirikufusaga70sub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_5fccd91dd6fbe.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/iaXIsgg/air_combat_simulator_online.pdfIn PDF document text
    • http://infonewsuk.site/buvifetagiapn74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5fe1ed0ea5928.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/wopifibonuturizumi.pdfIn PDF document text
    • http://itdiscounts.info/what_is_solar_energy_all_aboutqdg6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_603b8754dee7f.pdfIn PDF document text
    • http://babbieshop.ru/47985458274486j5.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/kokivopixumunop.pdfIn PDF document text
    • http://katipef.medianewsonline.com/how_to_add_kwikset_to_z_wave.pdfIn PDF document text
    • https://cdn.sqhk.co/muwunupudi/kXMjjjj/liparunufezepagakowowet.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/Ggchgjg/tonux.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/gghjii4/18507624855.pdfIn PDF document text
    • https://cdn.sqhk.co/nijusukelok/jh1hg94/download_game_sweet_crossing_snake_io_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_0912cdb5f086450e8ca2fcd8c594891d.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_7bdc6b39bd3642c2823d46fe5d7fc295.pdf?index=trueIn PDF document text
    • http://vunonam.atwebpages.com/don_juan_tenorio_resumen.pdfIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_c986c0b26b7243a890ce535001160d74.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_d4ec0595f9f047a0aad9a1e6aed1af6c.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_ba66897be6b0488ab74c85b630390063.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_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 5748 bytes
SHA-256: 0ab3fbd3025013a1f7ed59a2f9dfd655c3bc8e08f04836a7eabba0b1b9ce7e58
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 12804 bytes
SHA-256: 6f8e49a85597440a6eabadd72b6009baa0dbe8e8af223145cfa8ee74ef2d2ff9
font_02_sfnt_off00013d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D19 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2