Malicious PDF — malware analysis report

Static analysis result for SHA-256 779b6aafdcbadd34…

MALICIOUS

PDF

65.7 KB Created: 2020-11-28 17:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 76fd55cf93460c5e50f4a6749f79a106 SHA-1: 2d9d7937b265828d70a57455780cc5052a5745d0 SHA-256: 779b6aafdcbadd34d11b148a52f4918b02a2510d8f1836e972ae248b9065eb62
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites, possibly for malware distribution or credential harvesting.

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://traffking.ru/strik?utm_term=pa+wrestling+rankings PDF link annotation
    • https://kejedaxuz.weebly.com/uploads/1/3/4/3/134355680/6039472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_5fb9d5685bdd1.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/1184528.pdfIn PDF document text
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/4069288.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/loziwowew_jijonepoxa_molojokasaj_sonedewelon.pdfIn PDF document text
    • https://dokojivoko.weebly.com/uploads/1/3/4/3/134395563/600bcd550c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/bapogoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb387c2-cb47-48d2-bd00-1cecd1db5cd0/de_certeau_the_practice_of_everyday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df70c3aa-bc8c-4185-9fab-724db568e2ca/nehemias_9_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2820d599-35cd-456c-82d7-0cc9000faaa4/engineering_electromagnetics_hayt_8t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da788bb2-4f76-4a1e-a09c-d742dc11990e/72103054126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd321c4-44b9-4035-9cfb-834cc529ad9f/92769010245.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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 5008 bytes
SHA-256: c6126a3bad954917d9c89bc6d21be61e898c6b8b0bc14525c08013ac96bb453b
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 11040 bytes
SHA-256: 35da5afcc4720381346fc04a37ec3c08c96b3591ed9a8250cb7f4d117b4fa59e

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