Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a27f2e35dfccd86…

MALICIOUS

PDF

70.6 KB Created: 2021-06-08 09:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ab40f36c4bb33ca619f764b85bd989d6 SHA-1: 710cbbed57561f196672c92c5e65393ead833b64 SHA-256: 1a27f2e35dfccd862dddd3ea87a6c86119f8bc5d0c50ac8f7cf238bcb2f641c6
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://wastran.ru/pbw?utm_term=what+acoustic+guitars+are+made+in+america PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412159/normal_60335bc6df99f.pdfIn PDF document text
    • https://kewusubeve.weebly.com/uploads/1/3/4/5/134515363/rigiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6010cd1466193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_5fdb2f652e644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcdd04c06c15.pdfIn PDF document text
    • https://nigakanal.weebly.com/uploads/1/3/4/5/134527226/zolexol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_60b7be6047929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_603bdb86f2666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_60304375d7712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_602336e98d277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388421/normal_6006d6a14434e.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/e149368f-1652-4902-a447-1e1d028767fa/tijebozonomupetepurobaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad992ce-c130-4de9-88db-260dbbfa863e/64942766403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b92bd9-d290-4908-bffd-e4057efdcade/bepifesikumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc5ccb4-4331-481b-9b38-442eddc3624e/tableau_tutorial_advanced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0771b2d2-26bd-469f-b204-7c0709de6e24/40482137206.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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 5336 bytes
SHA-256: b3effed559b1f89332105fef4c8ca786bf558a6519c309e8c2bf6473827eac29
font_01_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 10360 bytes
SHA-256: d07f9503d8413135ae73f6fc2e3f2ddb38954c0d8f6cad9b1c7413d38185735e

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