Malicious PDF — malware analysis report

Static analysis result for SHA-256 b648df563c50f0ef…

MALICIOUS

PDF

73.0 KB Created: 2021-01-03 17:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 585f80bdfcd02778e4d64f9b916f5acb SHA-1: 77cc588af9fd85d928bbe4606f4c5b7a276b6954 SHA-256: b648df563c50f0ef16d9d3e9b408118f03eb29151ddd51c41aeb931fa75101d6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

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://trafffe.ru/123?utm_term=osmolarity+of+a+potato+lab+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426967/normal_5f9a80d21f210.pdfIn PDF document text
    • https://poduxerot.weebly.com/uploads/1/3/0/7/130776630/modenogipipasepap.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/9586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_5fdc73f47fc3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f92a67a7b412.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/04fe314.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/2898360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff0c843c9077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f8991c53a6ff.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/peveziwoguxuzam/tomumuwufux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29dd1449-1524-47d7-9d38-b9ef0074092e/47001373426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18a85e9-3ee3-4e33-9433-294ad90a94f0/jakeniguzumogikolugozepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2ab59a-b39a-4831-b373-6955d440b5bd/tipos_de_violencia_en_el_noviazgo_redalyc.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/bullizmi_ne_shqiperi.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5316 bytes
SHA-256: a2545b75fe8147c0e1a8688c34c5d1b74e34b8091bfe3aa61ff7758ce39ccf6f
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10864 bytes
SHA-256: b0faa3bcd45dee90e7c0773242e8c342a01b4852f5d0a94b5bcce4b5cd72e59e

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