Malicious PDF — malware analysis report

Static analysis result for SHA-256 37873b192156e367…

MALICIOUS

PDF

59.8 KB Created: 2021-05-25 16:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 39e9fb4b0598628c44827a71e9740f9b SHA-1: c0a76838a505f994fbb415e16eb8136c071f289b SHA-256: 37873b192156e3670774a03b6c8eaf69da329aa7bfbbb2c4f3c5e5b05ac89fd4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious and contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to employment cover letters. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8844

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://dugedepap.ru/strik?utm_term=employment+cover+letter+sample+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5fca8646e0888.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/1325194.pdfIn PDF document text
    • https://xonedanafesiliw.weebly.com/uploads/1/3/4/6/134633415/ba411a9e112c6.pdfIn PDF document text
    • https://samukolapupe.weebly.com/uploads/1/3/4/0/134017142/getowus_wanurezasad_datapilarixare_vabowazaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_5fce76f75aea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5fdf3a7ddb277.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/5a1bf3919d149.pdfIn PDF document text
    • https://bafibosu.weebly.com/uploads/1/3/0/7/130738803/duregus.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/9846985.pdfIn PDF document text
    • https://vafumuwolefuz.weebly.com/uploads/1/3/5/3/135325426/eddc0adc69ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_606ddf22f3dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_603df67f856d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_60567514c9303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b160e70-1975-4432-8be7-b9c632b329c3/direlenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317bf036-03d4-4d9e-b547-b35d2bc12090/stanley_fatmax_5m_magnetic_tape_measure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30d1ede-0a5f-479b-9681-c8a2c7cf32c2/vewejujagokolajefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21433023-2e4b-41a6-bd4a-08c58e6c70f4/59494008664.pdfIn PDF document text