Malicious PDF — malware analysis report

Static analysis result for SHA-256 7181b4a185fc0e33…

MALICIOUS

PDF

67.3 KB Created: 2020-11-14 19:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 37c23ba20c0e5811a4759c064bf61aba SHA-1: da80f9e7a38f6ed38fb4d8614cedad0aa7fa66a2 SHA-256: 7181b4a185fc0e3398463b9bfa4e87da5c18067bf759a42cb6cb23e2aa802aea
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?utm_term=light+bulb+security+camera+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f8a513322839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fab1afa39ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_5f9b1f2acbbc1.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/suxalopeb-lawudowiniripe-mavulefaw-zupuminabovu.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/ad64b301b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5f9a52e7e6ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_5fa39ebbf0218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5f906b4699351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f87ff3853eaf.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/4a60ce3f-c46e-4111-b797-7e6c309b83e2/on_the_apostolic_preaching.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b9395a-2d3c-4fc1-8bca-873f65c6c341/jokadawufovivanad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf83c32b-3ac1-45d7-ba3f-6038718af99a/band_of_brothers_why_we_fight_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2e1dce-019a-4e48-b40e-8c55fb638a4d/isumsoft_windows_password_refixer_3.1.1_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/729e3892-5e79-40fc-8e97-1541aec8ecb3/jemikivede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2dbb03a-64d2-4a66-88d9-6234b9afd24c/26989174472.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_off0000c965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 5548 bytes
SHA-256: 9a22cb3c52aad3dd237714562a3ec6b5dfbf582c0ba72aabdc02e68290cca21e
font_01_sfnt_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 10572 bytes
SHA-256: 18c0409f4be81cb341dc5d34749358a8cf331e3e70bea589b9105e2b607cf30f

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