Malicious PDF — malware analysis report

Static analysis result for SHA-256 77caf53be6817743…

MALICIOUS

PDF

74.0 KB Created: 2020-11-26 16:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0895f3922cbd54e4255ba20eb9bd1818 SHA-1: d0d7959d52526e65f3e658578011840cd9069cd7 SHA-256: 77caf53be68177435c481774d28dda11388f1b68004fa071e196259c45ab885e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://traffset.ru/aws?utm_term=1970+chevrolet+chevelle+ss+454+performance PDF link annotation
    • https://netopanuneju.weebly.com/uploads/1/3/4/4/134493403/1043f22eed.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/68f148888da839.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/xedewofuretujo/high_school_reading_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/61431698627.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/past_continuous_tense_exercises_with_answers_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbebc12b-3569-4365-8dad-8289ea7f48b4/ratigakozomibike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8291f9b1-2890-446b-8264-85f858ada633/97583029063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88fe51d-71cd-49e6-bd56-670a54f93434/luzed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44d3fa3-b8ed-4c01-aac6-472d42e5e15c/nosumila.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/5848244961.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/simple_english_speaking_course.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/mimodile.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/bodybuilding_videos_workout.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 5860 bytes
SHA-256: b5e48247b9993efbd06482f6d7e78956a035549e14be47871b1f07d0ed73d5b2
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 11300 bytes
SHA-256: 3e3c2427c186d2bf04252d613837e7c85989d9818ece2b2d9242012173d0c446

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