Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4edb78a46ed5c6…

MALICIOUS

PDF

72.5 KB Created: 2020-11-19 04:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ab9151da09d04ea254f171087bcf170c SHA-1: 1c623b53770bd44901b9d6a3127f2c949425063c SHA-256: ef4edb78a46ed5c6fe0a46fa01a26c1d9c8d84cdf47939850899a7df6a925e6d
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 0.9995

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://traffking.ru/123?utm_term=nicky%2527s+folders+communicator PDF link annotation
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/8067948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_5fb4a05b7a683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5fa62f3c18dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_5fadcb9a074dd.pdfIn PDF document text
    • https://fisezofibidan.weebly.com/uploads/1/3/4/3/134316577/solidezinumuzikag.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/jufixobevexoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/379d055d-012f-4c8f-8986-7a69cbc06d8d/7586278942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76374ae8-c5e1-4ba1-acc4-80d2cf1b8072/31436920796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ce40f9-f72f-4c34-a4c7-d9792880b07e/jumoligive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87762e8d-592b-433e-aae8-1e2478aae90e/pudomunefogeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e9d73f-a0f4-4354-af4c-ab18fb90dc79/48058330704.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2B 5220 bytes
SHA-256: 8844dfe0dacd3e29e4005d3622a5509e20147422d3f6fb73cbe64337b672d3bc
font_01_sfnt_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 9812 bytes
SHA-256: 78501d022bb46b1d5d9cc3d8336a27f1b2856f9881962259fe065aa24d290f0c
font_02_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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