Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ee52f65c41f844…

MALICIOUS

PDF

72.5 KB Created: 2020-11-12 14:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 500ada74700e4662a2de0320c2c22428 SHA-1: 97acc76fd65ff8b64955f9e44b27c94220830fe3 SHA-256: e1ee52f65c41f8448625c788075fad0b078466e971054b5a89f16d117841c0b6
156 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 5

  • 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.
  • 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://trafffi.ru/123?utm_term=usmle+step+2+clinical+skills+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5f987d3377e8d.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/a17d2cfe5b957.pdfIn PDF document text
    • https://suxomosiwe.weebly.com/uploads/1/3/4/3/134350922/dewewilinanivur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5fad12c7eaae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_5fa185f7898b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_5fa910c702b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5f9c0645d3c64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/bavapub.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/monthly_calendar_templates_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7aca094-c6fc-418c-92bc-aff66d3dc2bd/uber_social_media_fail.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/gikeditiriwez.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/2020_micro_machines.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/the_onion_fellowship_indeed.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_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 5392 bytes
SHA-256: b18f11c2939eb6cbf46e5298106453fea606954380980a0cb6fa53cedad37454
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10484 bytes
SHA-256: 6c5ac91004760c8e3df3e6a38d30cd4f8d3386acf597bff5ae7d4a16d1718b06