Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b60ed07c166e425…

MALICIOUS

PDF

69.3 KB Created: 2020-11-19 08:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e1db28d45d903243a1f43f24fc00ec54 SHA-1: 9dc2d19a6b9ef49728106f544995931b81815ed0 SHA-256: 8b60ed07c166e4250f3e3656b1eb938bdc54226338c7a85a7db7cffd434b05cb
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/strik?utm_term=amallyn+shadow+guide PDF link annotation
    • https://votuwokikinoso.weebly.com/uploads/1/3/4/4/134466575/68d84dce4f631de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f9cd9eca325f.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_5fa9991a28db7.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/8732516.pdfIn PDF document text
    • https://vujofuda.weebly.com/uploads/1/3/4/3/134375628/4420662.pdfIn PDF document text
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/7708808.pdfIn PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/d6146c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_5f980836d1882.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/6023986.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/tibitolidu_zupimenijunug.pdfIn PDF document text
    • https://gesivakegozuk.weebly.com/uploads/1/3/4/7/134768451/035b05485eee20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5f951a92558f1.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/rolezug.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/32ca4ca1-d07c-4302-8f09-46232ee84d81/wise_man_s_fear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df43a86b-bf75-4041-9411-d381005620cb/75446412355.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_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 5324 bytes
SHA-256: a5f95e86ddba2ef3b8716a30af19142b8737ec297f9b0e8a24f3d339066d43e1
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10984 bytes
SHA-256: 21b047ddf492d5cc3c2566bf71c743ed9426aa9a6d9bf4d4552d5eb8c8da6393

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