Malicious PDF — malware analysis report

Static analysis result for SHA-256 1387e6e43811ff63…

MALICIOUS

PDF

72.5 KB Created: 2020-12-29 19:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6b2961e986c107b78354741531346167 SHA-1: 75e5c295d1775cffa036465f8b5ce195755bbd89 SHA-256: 1387e6e43811ff63b695840d26967bc8b91f2b0bd6f4c086adeafaf54e2305d5
186 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 0.9997

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://trafficel.ru/123?utm_term=rosario+domingo+completo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5fe9b5db751a1.pdfIn PDF document text
    • https://gubepukabo.weebly.com/uploads/1/3/0/8/130873841/6ea25f4b343.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/555989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_5fc157af5ac39.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/a5bfa4736a6e02c.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/2faa0c.pdfIn PDF document text
    • https://judikojegewag.weebly.com/uploads/1/3/4/5/134583508/zogatuvuvi-sesonudopikaxe-kixeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/116be02b-d711-42a3-8c13-6f0ef4eca317/yeast_fermentation_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d38f34-0e30-44f0-8333-250cf9bc0a2a/69262565801.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/pekexefogonagirivebepite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b14cd8c-94bb-41a1-a3e0-a53c712bf435/trane_xv90_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb31f33-3f1d-40e1-ba81-a44ccab2e7c3/44131109721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfa5640-2214-4478-be98-eb19c5703021/46265566580.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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 5400 bytes
SHA-256: 99dff80100b1f4bdda5a6d2a2a3bd4cccef05e8d4f2466cc3b24232620c3d289
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10680 bytes
SHA-256: d420547b99cfcd0437647b1693485fe12f52c99570da30d3d016c61a56120c0e

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