Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e18d0107bce0efe…

MALICIOUS

PDF

70.2 KB Created: 2020-11-26 00:31:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dfde612f179e1d7ea3cfc3bbe16a7e78 SHA-1: 1e6b16866bb88311e14a9148c55a78c4ac455c7f SHA-256: 7e18d0107bce0efe3ee1d9a1c3bc0f0b1c81611e54041ab61b24802a0ec17abb
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://trafffi.ru/strik?utm_term=to+whomever+it+may+concern+letter+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f872b1e9ae03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_5fb99d9666c78.pdfIn PDF document text
    • https://zolekifez.weebly.com/uploads/1/3/4/8/134850144/tededupuxedare.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/5158532.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/3819095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f896df062c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5fb6d807e50ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fa924b888532.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/tisowir_bozilexamalir.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/e53af7b7-2b82-4d09-bf73-8bbeeefa5068/ligepabufuxupura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222de682-4f40-4461-b25e-169350fd7004/ridet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/356b4820-c8b6-491d-a266-170a2720c86a/gumosaxoxeromasazabawoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0b3668-612b-4909-a046-5a17f471282d/makatufaxolapikufijowuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acb6391-338b-454c-98ba-01bcd1d47abb/gaxagababixudado.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/understanding_the_linux_kernel_4th_edition_download.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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 5148 bytes
SHA-256: 1a5dceb574a0d21c3d00f74780e69a955cdfb8ac3e639048196b0485ba3f44e2
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 10132 bytes
SHA-256: ab430f188b0228941ff7a459419e4f1dcd19820347960f7d28ba5d3682d3454c

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