Malicious PDF — malware analysis report

Static analysis result for SHA-256 3256606c8027dc8e…

MALICIOUS

PDF

68.6 KB Created: 2020-12-20 21:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3399dfe43cf5d05a629abbb4aa428e55 SHA-1: 78346c9dbb0de4a95c5fdf7ebd9b66ffbaf8730a SHA-256: 3256606c8027dc8ec14388e23287c007deff8f5b6b726cf48ea42dd87576d0d5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF SEO link farm, suggesting an attempt to manipulate search engine rankings or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=map+of+maycomb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd64735f2977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_5fb4fed634c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fd205e736aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5fc2c884532b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5fa8eb117ba76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f878c1ff2c38.pdfIn PDF document text
    • https://bimexojagof.weebly.com/uploads/1/3/4/6/134655387/1564886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f9a09e730562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_5fa34d2a3bca1.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/9862509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_5f9b288fb2bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_5fb2c505c9fae.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/28044b0b-7e9c-41a2-abff-8d63b5746417/85659552928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afdd653-3922-4489-b3b8-8a6db6cc2449/zobibabenorajafarowuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64176a11-f90e-46b9-8933-01c6af21171e/what_does_archive_mean_in_email_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9769688f-a00d-47f5-8f15-1ff02485c4a6/5968673233.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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 5100 bytes
SHA-256: 88e06e348aa7ef0b1e6f502c70931f764279132509c9fde7e64604a117cd32d9
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 10940 bytes
SHA-256: 3c54004621405f5a865df25167dd1b17f709357f01f829429856d36d2ba6d96b

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