Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc4ac24d5a729c6…

MALICIOUS

PDF

82.7 KB Created: 2021-05-27 19:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0637712794c07d547638b90854ad394c SHA-1: e62c362ccbf9c352a124dd9600fae4b2272a38b6 SHA-256: 7bc4ac24d5a729c6cab17bc56dcec4b2ae088d1a9adcc4ec7a7219cf7a62eb51
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs indicate a malicious intent to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cdn-cms.f-static.net/uploads/4480408/normal_606e5e09a983a.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4472475/normal_6043fa05aa4a0.pdfIn PDF document text
    • https://xokokojimaxuwot.weebly.com/uploads/1/3/5/3/135345946/aa8590fa95e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5fe2bee106c93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489981/normal_5ff1415082fa7.pdfIn PDF document text
    • https://somejokal.weebly.com/uploads/1/3/4/4/134494219/kumejupew.pdfIn PDF document text
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/sujiwid_jalenaja_kodibubud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fd1ef484e501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fc6700911998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426816/normal_6001d1757a56c.pdfIn PDF document text
    • https://ronawidafaleso.weebly.com/uploads/1/3/4/5/134504313/1a4e5a938b31040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_602ab91e9e657.pdfIn PDF document text
    • https://pabovojusu.weebly.com/uploads/1/3/4/3/134339388/6532868.pdfIn PDF document text
    • https://jetebudatupa.weebly.com/uploads/1/3/4/7/134748577/69ed7cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=math%20by%20myself%20clipartPDF link annotation
    • https://uploads.strikinglycdn.com/files/df730af1-1f49-4631-9707-3b60aac72bfd/28568588659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddade7f-1d3c-4655-99e0-a50bbab2dd11/11384764092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ae5d32-ebdd-4b49-a3e6-594a7f939925/24480146851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f2bc1f-58ed-4d42-9464-172d5cee6e04/buxeworobupabuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c631a5d-b836-48d4-9eb7-c861038324e3/36158538853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b04ebad-b083-430f-bd9c-fc9e3a937dbf/teenage_chore_list_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb2781f-dd69-4e26-95ff-d4b672d00819/63663442013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5b858c-cd3c-4fc2-8e38-7baad2032adf/bakadurekunajumivegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e12e16-b19b-41be-80cb-30fe2047df57/27855806273.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 5500 bytes
SHA-256: 538b11a4c1e4facfb993a1c868a0fd7bb31962433536126376d94ba621cd02e0
font_01_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 11040 bytes
SHA-256: fe0cf08f263e130eb6108efffdfb821766cc771da7bb9577b30eb53c137f8918