Malicious PDF — malware analysis report

Static analysis result for SHA-256 644bb52c6bea131f…

MALICIOUS

PDF

64.9 KB Created: 2020-11-23 20:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 157e2ac02e700f16febf912448344b92 SHA-1: d2767504f0252095d83380502cfec3e8c58065bd SHA-256: 644bb52c6bea131f05a77e2a1ee88286782f9213eb6d4dfeedcad354d53b0c36
214 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 and routes users through malicious redirector infrastructure. 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
  • 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.
  • 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://ggtraff.ru/123?utm_term=verb+querer+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f90caa2ecb8a.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/jidukeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_5f9c6fcc9617a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5f893214cb98a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5fbae5fbda3c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f91311b32144.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/3ed97eec-8e78-4902-b968-860b7a5cbc86/garelezoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce07c43-5f8c-4c45-86dd-3f35ee6b0dc7/67616028468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c60d36-e18d-4e26-b1aa-ed60fe021527/33754691093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47a45a6-0be9-4335-9c8f-3b1d191b861f/74397840330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b0cb07-68a3-4db0-8ad8-a72bfab233c0/tixabebulavopeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ce8776-76fd-4db8-a732-cd0cd6fab6b4/pifolofobubepamexugegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbd4700-7346-4f1b-b88d-89f2754e83c6/8784403773.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_off0000c16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16F 4916 bytes
SHA-256: 8b66f09539f49f29327964b25f4537e938ba2fd1d68a3f7115f92e8c43291a6f
font_01_sfnt_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 10708 bytes
SHA-256: 1f45f71b01f181958ec520023627b3ec3e43c46fd8d0bf2c861b2b4ec7e7633e

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