Malicious PDF — malware analysis report

Static analysis result for SHA-256 224508c7eb3430f3…

MALICIOUS

PDF

81.5 KB Created: 2020-12-18 11:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f1f952406c0e0cd32cf957d1d89db42d SHA-1: 6e5e93ab77c2cf736ee110b92bc1e320a7211b69 SHA-256: 224508c7eb3430f385c347864a8989c32b8f9b2dc6e2c8072fe69f1bb652fdaa
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=examples+of+letters+of+interest+to+be+a+coach In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f90c8acb82fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f9ea70c4422c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454429/normal_5fa8046584b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f8d2d5d7caf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f89c5402a5fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5fa0acbc19c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f8d48116ccbc.pdfIn PDF document text
    • https://zewugijisisu.weebly.com/uploads/1/3/4/8/134885238/nalexelul.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/mexefawekasobaleluwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_5fa86a64c35d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5faf012852079.pdfIn PDF document text
    • https://kizulivuvuruzor.weebly.com/uploads/1/3/4/8/134850547/zefidavetab_texasudugexini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_5fbba071d6af2.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/66866122-0e3d-45ac-aa29-82a3e1072e34/how_to_cancel_verizon_prepaid.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A43 27428 bytes
SHA-256: 888599b080baaf72dd8432ddd3c1a94efc0bd9df862f15234d8ccfa38a9be5e1
font_00_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 5420 bytes
SHA-256: 8606f89366757935a6e50e833beee570243afd494b165578261a4400a69b3cbb
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 10408 bytes
SHA-256: 811218d92f8aec688755521508cf36a997ceb8691899e683528e0bba7a489e12

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