Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42eeebd3e6c8bf0…

MALICIOUS

PDF

67.3 KB Created: 2020-12-22 02:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 240c8762f95d50448d47a1411a672dd3 SHA-1: 2654e3546bd44eb98eba8608db18bcbc72040978 SHA-256: e42eeebd3e6c8bf0923345bee0118f9471209f99f52b8f9e9e6b7131c627ad15
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on various platforms, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs suggests the document's primary purpose is to redirect users to potentially malicious content.

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://trafficel.ru/aws?utm_term=firefox+52+esr+for+mac PDF link annotation
    • https://puzemebakojufem.weebly.com/uploads/1/3/4/2/134234574/7033392.pdfIn PDF document text
    • https://zonisobeb.weebly.com/uploads/1/3/4/3/134333784/2771682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5fb8851c380e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5fe11f125a301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5f994cb38ddbb.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/pafiganovavi/20132508606.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/fedezadi.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/guided_reading_groups_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22df3215-a289-48bf-8300-49c530175ada/6661211985.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/lojekebitok.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfff689955c744b536924c/t/5fc569f44e98326c02c7edb8/1606773237253/9860447066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de118f13-097a-4a43-b5ea-a0996e9e6fbf/dexter_public_schools_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c03e5a-d9c1-4096-8ee2-5add69fcc3d4/gerulipor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe001beaf37e3b646231f0/1606287405177/granite_rock_pans_at_walmart.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_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 5272 bytes
SHA-256: 19247ea4ed099656aeebc7d22ca21433928b72ade57f81aa6d76331195bddcb1
font_01_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 11132 bytes
SHA-256: 2937a5093ef968a3f108e9ba6010219a3f4ad85ad9d802ef54630c140d12b286

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