Malicious PDF — malware analysis report

Static analysis result for SHA-256 5426b09f00d39b69…

MALICIOUS

PDF

92.5 KB Created: 2021-03-16 08:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a80ac84029b60164be314bd7318133 SHA-1: 508086e1223fc6fe74509576d7176dc8679c06fb SHA-256: 5426b09f00d39b696b623f4c7e1ea496be82928be187836a1ee52e39011191bc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, with the primary malicious URL being 'https://soxebez.ru/award?keyword=andrew+cardwell+book+pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/award?keyword=andrew+cardwell+book+pdf
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/gomupib.pdf
    • https://waxusebodik.weebly.com/uploads/1/3/4/5/134529962/a97499d39e13dbc.pdf
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/8306126.pdf
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/2442876.pdf
    • https://cdn-cms.f-static.net/uploads/4417983/normal_603f1249784cd.pdf
    • https://cdn-cms.f-static.net/uploads/4415045/normal_5fe898d44e34d.pdf
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5ff110bc7bf34.pdf
    • https://fetubuka.weebly.com/uploads/1/3/1/3/131379928/58b55ff9b.pdf
    • https://static.s123-cdn-static.com/uploads/4385413/normal_5fedff1dd4571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_146df0204b584ee7ac170deb9b348c6a.pdf?index=true
    • https://s3.amazonaws.com/bivanud/a1c_average_blood_sugar_chart_type_1.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_d2d9d131357941bf965385d6f9cde588.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15965392-42de-4ac9-a98e-7bc303daeb9c/air_force_football_uniforms_vs_hawaii.pdf
    • https://s3.amazonaws.com/degagaziv/payment_summary_statement_template.pdf
    • https://uploads.strikinglycdn.com/files/7114990c-8e17-4fcd-83da-2ee7aa263f90/92570699032.pdf
    • https://uploads.strikinglycdn.com/files/1c2e9d74-ca70-41d9-91ba-6fe489cc5ed6/davinci_resolve_15_tutorial.pdf
    • https://s3.amazonaws.com/lanaladu/academic_research_report.pdf
    • https://uploads.strikinglycdn.com/files/e89a6e83-fd69-484e-b5b0-f2433b8f5653/solozavirubup.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/xarebejekexetoriziwub.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f743.bin
792e288023e4fbe73a0351c4e4cf94c19217598e688914c0413f09f13c1160d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 6568 bytes
font_01_sfnt_off00010790.bin
e7adeba18b167070f9d65fe96eafa94723cd9eace1067651606588c64db01df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 4916 bytes
font_02_sfnt_off00011848.bin
b5dc57b365127e350f84a2d364f488afe3a014a010f0010f5e7caf1a37d11eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 11692 bytes
font_03_sfnt_off0001406a.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 16344 bytes
font_04_sfnt_off000155e3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155E3 4324 bytes

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