Malicious PDF — malware analysis report

Static analysis result for SHA-256 401ee92172f3a70f…

MALICIOUS

PDF

64.2 KB Created: 2020-11-10 22:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 854e89a2626a28ed3a5dbdc52a4d55a8 SHA-1: 28fcafd7d6c244a16fe0e43d092b4962509f6401 SHA-256: 401ee92172f3a70f33ba77bd092fe3ac730f8730b02612bfb78504f1ff717d96
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/strik?keyword=google+mail+tabs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_5fa0216a3af29.pdfIn PDF document text
    • https://wanezetisozol.weebly.com/uploads/1/3/4/4/134468493/6dd957a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_5f996b71e7d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5f979b349f18b.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/84a99d1c73d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5f8e75966bf48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f893ab836dcb.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/02659c5e-8e2f-4c2d-9f2e-1cb822c0de28/81964537666.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/simple_mp3_downloader_pro_1.0_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9a5a85-ee51-45de-89c1-e13cfbae3489/captains_license_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/phonetic_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a87e80-c963-4b10-8c34-da8e122861b3/zezilarigisibogazin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bef1dd-91e1-4efa-bd0d-ab57852cd8c8/tozevozuguwotefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b969dd08-0f65-4d42-acf4-5ed3c3157332/wirijanotemogivix.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/8086_microprocessor_bharat_acharya_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67B 5080 bytes
SHA-256: 1fc99efe94bfff0ea4d72de36c51c93164758c3bff3eddb670b8c1cb1531a33d
font_01_sfnt_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off0000d188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD188 10072 bytes
SHA-256: af4fa2f4d293547917e24305720395006a65cd1ec8cc2a9546c46b21cb1bfbac

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