Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec54a9a60149b97f…

MALICIOUS

PDF

72.4 KB Created: 2021-03-15 10:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a5be7ecea2bf8dd07d8c975df5174782 SHA-1: 39a7fdbd5f975a922e7feb797da5bd42eac47970 SHA-256: ec54a9a60149b97f6c711644af635d209f6742cb38b61c7053a51613c6a3255b
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 0.9993

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://maypoin.ru/strik?utm_term=geronimo+stilton+kingdom+of+fantasy+pdf PDF link annotation
    • https://vulotimemoje.weebly.com/uploads/1/3/4/8/134846769/67106c94bdeeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_604d8e5c97d17.pdfIn PDF document text
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/4757980.pdfIn PDF document text
    • https://kadimonadi.weebly.com/uploads/1/3/4/4/134491006/torewotaterud-wuguku.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/tebarosiso-kupozaxabix-wadibinolo.pdfIn PDF document text
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/farafusukubem.pdfIn PDF document text
    • http://wuxevonatot.iblogger.org/tevin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_60393cd87435c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_60309c42323a3.pdfIn PDF document text
    • https://felomavemupej.weebly.com/uploads/1/3/4/5/134583365/5fd5dbfe5945477.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/jhib9ig/lokemuwemuliwufur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6046dbdaa7bcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5feb32539a546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5fe5653aee4d6.pdfIn PDF document text
    • http://zijiwox.iblogger.org/tamajojoteximavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5ffdb7de129d6.pdfIn PDF document text
    • https://sedusubix.weebly.com/uploads/1/3/5/3/135333985/vinorinoliw-karufuxidu-sapabedoz-nolegas.pdfIn PDF document text
    • https://befinutu.weebly.com/uploads/1/3/5/9/135971501/9765267.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/Rv5ihyD/tamilrockers_hd_2018_telugu_movie.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/zatilat_repubunisuwana_bixuze_monetakelofivi.pdfIn PDF document text
    • https://cdn.sqhk.co/rezebarowed/h9hbhii/xisit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bisubop.epizy.com/acls_guidelines_for_antiplatelet_and_fibrinolytic_therapy.pdfIn PDF document text
    • http://vodugesivizere.epizy.com/star_wars_galaxy_of_heroes_pc.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 5556 bytes
SHA-256: cc7e80c1c2283503bcc68090babd9cb549b94204b5f396674bb1ca649f93c9fb
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 15564 bytes
SHA-256: f9a42b23437ae15caf557af0fdbbe998d216c98f8eb39fc6ec504a5af27c1c57