Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8ea2d01fd43695…

MALICIOUS

PDF

84.2 KB Created: 2021-05-23 20:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2168c2f159655978cc871b9577635cd6 SHA-1: 55ac24ebbc3c7e649b09cad058e9db17010d4f52 SHA-256: 8c8ea2d01fd43695629caa905d731b331c7208ff165fed4eabaf6642362a15e5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/strik?utm_term=adobe+illustrator+cc+2015+mac+amtlib.framework
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6010ea12972f8.pdf
    • https://faraxebeg.weebly.com/uploads/1/3/4/4/134475962/7567983.pdf
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5ff4ae6388574.pdf
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/d0d3b.pdf
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/kusigonegilobema.pdf
    • https://cdn-cms.f-static.net/uploads/4449627/normal_600bc5721e32d.pdf
    • https://cdn-cms.f-static.net/uploads/4475196/normal_60582773c38aa.pdf
    • https://static.s123-cdn-static.com/uploads/4421330/normal_5ff28197c875a.pdf
    • https://cdn-cms.f-static.net/uploads/4484399/normal_6040c607d4fb0.pdf
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/57e564eab52270.pdf
    • https://cdn-cms.f-static.net/uploads/4420034/normal_606baad705d94.pdf
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/7a1349d6894.pdf
    • https://mofasabopileb.weebly.com/uploads/1/3/4/1/134109330/favatoxan.pdf
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/74fcdd0.pdf
    • https://cdn-cms.f-static.net/uploads/4490369/normal_604b125ab8a13.pdf
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/ritoropokufug-zaduvinanedox-munadodavi-vugira.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zopenave/vulotutazopi.pdf
    • https://uploads.strikinglycdn.com/files/e9c98060-37bb-4eaf-b7f2-71a359ced348/what_is_the_main_idea_of_the_pilgrims_progress.pdf
    • https://uploads.strikinglycdn.com/files/b6dbce95-21b7-4f71-be65-a4993622ac8e/namamatajosiwesif.pdf
    • https://s3.amazonaws.com/nedijowewoded/adobe_flash_player_windows_10_chrome.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f404.bin
4327a8856920f5490521cabbb29775ff754819f0f937a541f8d37289c3e15bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 5936 bytes
font_01_sfnt_off00010842.bin
6332a84143ca4161335da20176cd8c51636c9dac77c1c610f9848ca17546f57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 11412 bytes
font_02_sfnt_off00012e29.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 16096 bytes

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