Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9a4fb15d5b9d53…

MALICIOUS

PDF

76.5 KB Created: 2021-06-02 12:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 23a201cbdd2814aa36e330f6e201d7b2 SHA-1: 57309b4a29c06ff7447ac293edac44468bf78440 SHA-256: cc9a4fb15d5b9d5317724dfadfe3799be4643f4c6e78c00993b86ec94f4911d3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a site that appears to be part of an SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=steel+beam+design+calculation+spreadsheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444115/normal_606d544513ad4.pdfIn PDF document text
    • https://tafajasezo.weebly.com/uploads/1/3/4/3/134312542/sovege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_606b08bb31cab.pdfIn PDF document text
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/varigatiwaxin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_605ce963e7266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fe10288214e6.pdfIn PDF document text
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/nemedu-logurakaxegel-ritemajinabisut-fojedope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a2fdd4a1-ec1a-41f7-a2cc-86c95594e6d2/mysql_beginner_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28d0950-1ad0-4fa9-bdad-83b0d13f9373/bidisemifuputo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08080300-a0ce-4ac2-b78f-40e14be29561/an_introduction_to_modern_econometrics_using_stata_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd66b3c-110e-4263-b894-e5e2a94bf8b8/32964537911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412d6e36-f286-4fa5-8858-58cbb7eaa87f/essentials_of_statistics_for_the_behavioral_sciences.pdfIn PDF document text
    • http://xawaren.pbworks.com/f/ferivatagurova.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/lokajokawonubagaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aabf0be-4a9d-4bf3-84e7-640d98a59e7b/john_deere_power_flow_bagger_system_for_425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf26bd8-8d4d-4505-96db-ec292ebc6b2b/vuxotezebim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040edd83-e4dd-4a03-8e9a-5e7aadad0be2/betanoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ef8707-d5b3-4eb7-9d16-90eb66f7dff9/moon_river_ukulele_chords_frank_ocean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee6c000-f92f-4852-a1a7-1b159167050f/96222703347.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 5612 bytes
SHA-256: 84cc7b709c84c457796246c45c2794d1d416a0baa7692580fc1cef192765ba5e
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10044 bytes
SHA-256: 1416a6a04d7a50c0baa1b1b879db76c9d9d2f5f41a3d058f50f9a0ca8194707b
font_02_sfnt_off0001169b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3