Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d4af9ecf4128e6…

MALICIOUS

PDF

63.8 KB Created: 2020-12-16 17:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e0a293ebbc2e4edc5699eab3bd74b1aa SHA-1: e0ffa42c5cf7d092f60cebf43b476414e483433f SHA-256: a6d4af9ecf4128e64d058e54d4cbee5d0ade9567b40745ea5ed23302f278c131
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of embedded links, many of which point to known malicious redirector infrastructure. The document's content, though obfuscated, appears to be a lure, possibly an installation manual, designed to trick users into clicking these links. The presence of a download button heuristic further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/123?utm_term=est+irc+3+installation+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_5fd6849fb25b2.pdfIn PDF document text
    • https://wunapeno.weebly.com/uploads/1/3/4/6/134621426/famugof-gisojujivageze-fojemopekilivun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5fd68a79a3063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_5fbf4aa35a9a0.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/7d211d88c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_5fd67bf923155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fd60bf25eee0.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/ca53ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc531e3c14dfd36fe0d9a42/t/5fc6c49b48d5672cfb28b588/1606861980064/37790479542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d62ce6-71e9-4017-9665-27e527d3479d/58002833290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6a7154-493b-4744-a03e-1e734f54c669/impaired_gas_exchange_nursing_diagnosis_heart_failure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34718a73-73e6-4ff1-94c0-557a9365ea84/antigone_sophocle_pages.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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 5064 bytes
SHA-256: 897f546217046eff867f6f135672fb65a78b2698e24f32005f064b8b772cd5dc
font_01_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 9768 bytes
SHA-256: d2d3d0fe4685386b12f389fc0573c16a7b4f5bb1bb0b8a3f4a8e3b038b21d386

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