Malicious PDF — malware analysis report

Static analysis result for SHA-256 836508ad8a49a3cc…

MALICIOUS

PDF

66.7 KB Created: 2020-11-24 01:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ff0442416eb2f18a96b0bff0c02bd77 SHA-1: 48029d1196bd447b759a9fe119eabcead2d68058 SHA-256: 836508ad8a49a3cc617f421c71b848175198a3ae2fa4692abe650cab0d971376
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=corel+draw+x7+portable+crack In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_5fafa24a8f433.pdfIn PDF document text
    • https://norajinojo.weebly.com/uploads/1/3/4/3/134381333/680fc82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5fa17d0290665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5fbc06345918a.pdfIn PDF document text
    • https://batarodev.weebly.com/uploads/1/3/1/3/131380453/54557b67fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fbc3e7c5fa31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_5faa61ae8c1fb.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/b2f4c22a-0bf5-4b97-b918-7c4b9277a6f0/nidumexis.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/double_eagle_airsoft_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067403b2-4316-4340-879d-949b8b1901cb/edge_level_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05dd0f4-1d90-4b77-b75c-ed97f7c1e86b/29335572352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68a4f3b-5a0a-4e90-8bab-38a1245b84f9/23727042456.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/elementary_korean_tuttle.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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 5240 bytes
SHA-256: f9226f52d5dd4236d7fedaa299fc397093f802f0103743cb506a9398f10655d0
font_01_sfnt_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 10768 bytes
SHA-256: 59fc03f0f663005dfd80e3e93544d6464e4360f2679d4eeb5cd1c2a063461458

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