Malicious PDF — malware analysis report

Static analysis result for SHA-256 750ea794fc3a73e1…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 19:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4d415ac364efd6f49651ab9c604b39d8 SHA-1: 172e1ab5d210995500cbac909ccc91de2f5c6221 SHA-256: 750ea794fc3a73e1afe16ba98704850c6ca3ae8289b266743c72580e434a922f
194 Risk Score

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 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 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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
  • 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://xajibur.ru/wix?keyword=tower+defense+minecraft+games PDF link annotation
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/4818409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_6012d514113d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_601b9a5e72269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6037c8096e049.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/5016390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449402/normal_5ff5502bc36be.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/kumojokiwiwivexaveju.pdfIn PDF document text
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/2506867.pdfIn PDF document text
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/fozamajixip-lidavefurofexox-rofezabukewemu.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/7b630b6e-9e49-4d05-948f-735f05872465/how_do_i_use_my_nikon_d3400_as_a_webcam.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_277907f7e236487483f1b9b1c8e62e02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/zudujabinuwesolabi.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_a178ba5385484b47a114281f6cb9889a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/cet_form_2019_law.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_d94c682359424d359bd49a006bd72b23.pdf?index=trueIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_adaa9d641f954ff49dbc09703fe7943b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/155ad552-c8fd-4edd-9f29-acbac4bbc760/deverowowusazaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059bcf2a-8f4a-4bdb-b96d-23fd0c410bb8/dilifaxuvobikigigotib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd219653-24ba-4f06-b7d1-9bc9c93c06e2/samantha_jones_sex_and_the_city_birthday.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_13fb6801de72436ca6c61e95842be17f.pdf?index=trueIn 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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 5348 bytes
SHA-256: 52703efe3293df38802f1d217469fb25043d0b15864d3deeba6881dd186a89f3
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 10596 bytes
SHA-256: e0961dd69bbb309f14b508ef7a1f36937ec8214fccce916f94abf028a95e1658