Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6f989c3793526f…

MALICIOUS

PDF

72.6 KB Created: 2021-06-03 10:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e9cd7ada54b94b6776b5f9d228709e4d SHA-1: 50dc8b297ba22fd48031f4085242076d782cb5a4 SHA-256: 4d6f989c3793526fd976104f533c9cbff059217b0ed7a63e660669006cb576a0
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 0.9997

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://vilenefex.ru/123?utm_term=farm+animal+worksheets+for+kindergarten PDF link annotation
    • https://jejedutetobi.weebly.com/uploads/1/3/4/6/134662716/4aadd32c864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462065/normal_5fcd44880e110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_600917cfc858a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_604a6826d1aa0.pdfIn PDF document text
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/tirexepesez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_605a24cf21676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5fcceb7ed3870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_6041e2bc2d08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_6013b18ee2c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6026b34663ccf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_5ff28b27beed3.pdfIn PDF document text
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/pevenela_nijedefemixa_xexupezupolij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5ffabaefda77a.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/87343972-a97f-4f69-afb8-857f50dda71f/massey_ferguson_240_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3b8f05-6121-4a78-ba8c-2896bb9d6ba3/zujutonokezusanubabivuziz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55813629-fda2-49ab-9e03-ee19c8f4cb6d/zawunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71245782-8c2d-4bdf-8259-bc997232f166/interior_angles_of_a_regular_polygon_measures_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12939d74-96f7-4b3a-bf94-836e98b5c112/how_to_connect_tws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a693b9f-b082-4a45-90c7-d7b04db3f8fa/employees_federal_credit_union_paris_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9009f02-264b-4bcc-ada1-4930113024f0/sesezinalekidatiromapesis.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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 5432 bytes
SHA-256: b53160dfedd51f2ac06c33ecef9c5d37b662822dd4f58d469d65ec1995d17db8
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10080 bytes
SHA-256: 171192fda386b6a88b73960c4ee49a6ae7e0e7f1ba70e207554ebd1f1773dd71

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