Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c447cbcd18922f…

MALICIOUS

PDF

50.6 KB Created: 2020-12-06 02:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 05b3b77c2e3a96bff7e75c5252625f56 SHA-1: ac7b8954ff968e7c0638310eee861f0a59910e07 SHA-256: 86c447cbcd18922f0dac2b9903050211d322390d3cc8c29f641b0494ff62678d
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or the use of embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8101

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?utm_term=consonant+digraph+worksheets+pdf PDF link annotation
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/2626855.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/5b227d75e5.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/9920746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462727/normal_5fb642e28e2ac.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/24951b0e8.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/kuwepegovan_delamijufe_nuvofid_dowazatunonur.pdfIn PDF document text
    • https://sivifarikajuleg.weebly.com/uploads/1/3/4/4/134487261/5ac2e0.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/4491711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f8bf3a985693.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/c67283b2-515f-459b-adf9-07220a49a0e7/14328712428.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/activity_log_fb_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7aa93c9-04f7-4b51-be7a-571956d2e21e/lawumujebolefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c48b0fc-71db-457e-887b-78debceb905e/50902869228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6210e5-07c9-455e-ac17-e3a1c5fa609c/povukadedizesusezodikud.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/gartner_report_for_endpoint_security_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27d5b9a-c6a6-49b1-938c-a230a31aa7ab/download_netflix_on_laptop.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD62 5332 bytes
SHA-256: 33131b43cd689cd1bac31f726411da647e12f83980484219144d8bd3be2bb4eb

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