Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c355c427c7e2a7e…

MALICIOUS

PDF

70.5 KB Created: 2020-11-19 13:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8c75099faffbf90e22726bca0b647c2f SHA-1: 22f802bd1a85793afe64717c3be84947740ab930 SHA-256: 5c355c427c7e2a7e485961e4fb8e61b2bfedbd4093661007bcd0fa616f604e5a
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 0.9998

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://traffine.ru/strik?utm_term=plano+de+vendas+pdf PDF link annotation
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/2570998.pdfIn PDF document text
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/963e7f1cbc4e.pdfIn PDF document text
    • https://gulijigomun.weebly.com/uploads/1/3/4/3/134350957/simalum.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/1624187.pdfIn PDF document text
    • https://zigeginuserepu.weebly.com/uploads/1/3/4/0/134041232/vuvakasaneseb-napuk.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/25435a71-0ae3-4557-811a-80bbe5c03287/zowujaludu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7877730f-0874-4cae-9254-d51871ef68b0/259496121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228a5b2b-9546-4f7e-b0f0-d26df2ffc48d/fajazogolufovire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31964de-b544-409f-ae4e-e6a91f338b06/bires.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098a4ba2-b7ea-4a2c-8a0f-bf60f7efc308/shri_hanuman_amritwani_part_2_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe3f4bb-2f4c-4e99-ac16-a5b8dc65c262/limbo_pc_emulator_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/basic_programming_language_syntax.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 5000 bytes
SHA-256: 5fee4625ecf54db9b677c970e7b168ed60721d75e07aee5fb8e6c7f8c974e27c
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 11288 bytes
SHA-256: 1dbe572d8fb10f90e0bbc52e13d6022a5ebc21c1360ba14e00080b2fe230607d

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