Malicious PDF — malware analysis report

Static analysis result for SHA-256 718f71a599350a85…

MALICIOUS

PDF

79.3 KB Created: 2021-04-09 12:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47b0d7717fa808b878507f6905a2dc07 SHA-1: 7968e99423d0d10b3d1be9378d4251d1c058e8c1 SHA-256: 718f71a599350a856a3084ce42e498eaaca7c9d60fe3e137d114b4a5594a5d36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://zajinet.ru/strik?utm_term=how+to+teach+main+idea+3rd+grade, is present and likely serves as a malicious redirect or phishing lure. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=how+to+teach+main+idea+3rd+grade
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5fe8e5872d4f1.pdf
    • https://cdn-cms.f-static.net/uploads/4393791/normal_6025e9a163836.pdf
    • https://cdn-cms.f-static.net/uploads/4412388/normal_605bea338b222.pdf
    • https://cdn-cms.f-static.net/uploads/4393361/normal_600d6d1fb5d10.pdf
    • https://static.s123-cdn-static.com/uploads/4474998/normal_5ff76938930cb.pdf
    • http://kotumixevana.22web.org/66221297505.pdf
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5fe6beb333750.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_c9f54795619b4738b08275a81f1328e7.pdf?index=true
    • http://gumubagigafaj.rf.gd/sevovabagopawipimiridez.pdf
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_95128666afd04c148dcdf8472812aa32.pdf?index=true
    • http://rodiwelivetekuf.epizy.com/augusto_dos_anjos_eu_download.pdf
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_88d7c43b16b944259c1014d2fdee32ab.pdf?index=true
    • http://pusupap.rf.gd/backflip_ka_dar_video.pdf
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_4f5bae9d09014e478fd76e86a815ea6b.pdf?index=true
    • https://78832258-a450-4746-8c2e-8ebd7c1eaafe.filesusr.com/ugd/c4f63d_1a0fa21bb60b4b7f8777065a16317fbe.pdf?index=true
    • http://jalovunenenema.epizy.com/abound_abbott.pdf
    • http://sulunaza.epizy.com/sasixawel.pdf
    • http://vulafaxenoza.epizy.com/activator_appliance.pdf
    • http://kesopepi.rf.gd/20454326761.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f991.bin
e1c75b4d4a6b3674500f45909d8287965d665d1c74c4f4c5dec6d27e5557d3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 5360 bytes
font_01_sfnt_off00010bb0.bin
6d159ec2a54f289186af789412355b0e01557182aa5108587dbde37cd8c6ed25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 10492 bytes

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