Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34ae0337c3f3336…

MALICIOUS

PDF

66.7 KB Created: 2021-06-05 16:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c50c6bdd0e24500a12de1b6a77439792 SHA-1: f5f006feaaa66270e39239cb07ec3abd3b4d658e SHA-256: a34ae0337c3f3336661c9ba02d8af8f195c7d50e5b62afd75f97a0b860a9f0db
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://krisoc.ru/pbw?utm_term=can+must+may+exercises+pdf PDF link annotation
    • https://kejopawilut.weebly.com/uploads/1/3/4/7/134709951/digisubivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_6065c3179fa5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492897/normal_6046e58690063.pdfIn PDF document text
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/mexegojew.pdfIn PDF document text
    • https://zuvexege.weebly.com/uploads/1/3/0/8/130814851/falibomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408177/normal_6008dbd0c1699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471969/normal_5fe5d9ae8b892.pdfIn PDF document text
    • https://vekupaju.weebly.com/uploads/1/3/4/4/134479754/lorimuduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_600c46825f53d.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/f015dc5b-b39c-4318-a0dc-e9bff56e9e79/fivejamozurepamoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15aa6a67-4b54-4b3d-a36c-d1f67c0a3b1e/welawibir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca9f78a-8634-48a0-b39c-084630e3ca3b/tyt_ayt_paragraf_soru_bankas_nerileri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3d1753-650d-42ef-bc9a-1ad37c639225/sig_sauer_p320_x_compact_vs_cz_p10c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e79923-7bd6-48ab-aaa1-b75bebc45ae6/90571512163.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 5344 bytes
SHA-256: 5637a3266d89d3076b05b3dd9d93859444e245a65bce578097ca194ca376e6e8
font_01_sfnt_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 11040 bytes
SHA-256: 0716f9b8ae84c93fa911e3b2ea0b5a446d2f166bbf5e04396d8187b162a24e6a

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