Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c672895be6d7fdd…

MALICIOUS

PDF

96.2 KB Created: 2021-05-20 08:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ddbf47efe5aa098fafad67159d8cf671 SHA-1: 73e52d69a500744b1b3bac7d4d6cb58116936cc3 SHA-256: 1c672895be6d7fddc4ee3d3c2a130035cefacbda37dac41060cd21dbecda0d7c
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://midufefew.ru/strik?utm_term=asus+ai+suite+3+undo+overclock PDF link annotation
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/9154430.pdfIn PDF document text
    • https://savozajit.weebly.com/uploads/1/3/5/3/135320594/e66e51bdfc21523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464735/normal_603d4642de9e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_601b7d1243a4a.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/9e6b5606-6d34-4f23-8b22-0afe23cbb1fa/mefelo.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/a_certification_study_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/duxarigabinopofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471f42bd-ccea-457a-b600-dc44d4ad71e1/73920483384.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/6088297778.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/39683401509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcefe4ce-61b7-42b5-a1d6-46bf7c730252/retolekamitaviberemoniv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd29516-2a59-4e81-8262-2578834bc018/bowflex_xtreme_2_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aeefa45-44a3-455f-a44c-edbbae83535c/formula_de_volumen_de_solido_de_revolucion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3dc1cd-9fb1-4713-8b27-e14d5bcfa782/64805312788.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/chrome_remove_plugin_manually.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30952c00-19c3-42dc-9927-b826c2af5cd9/biritedebubalezaxid.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_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 5208 bytes
SHA-256: 57fb24222cc0dac30475ff1e226bbafec2a88a318ac9a98717c643b860057f3b
font_01_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 11336 bytes
SHA-256: e7e6c061a6c477112f2bb92bfe9bc54ecf06c5992c552705c56692851662d429

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