Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5b478ad5eb9d46…

MALICIOUS

PDF

102.2 KB Created: 2021-06-14 00:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a231ff827b61cfafdec4b18dc67af5b3 SHA-1: 25e390f8487733b7d7e285966a6ee6da67a97897 SHA-256: 8b5b478ad5eb9d46a9b241836739d55a8ba4054e2d5be8815dd06c48962712f9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9533

Heuristics 5

  • 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
  • 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://drafthe.ru/pbw?utm_term=minecraft+pocket+edition+full+version+free PDF link annotation
    • https://gapetomoje.weebly.com/uploads/1/3/2/8/132816106/7986264.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/6711364.pdfIn PDF document text
    • https://jawubabob.weebly.com/uploads/1/3/1/0/131070379/613609b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_604d7d8faf3e5.pdfIn PDF document text
    • https://fitelibisubun.weebly.com/uploads/1/3/3/9/133987071/vajeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_606e3bf521e5a.pdfIn PDF document text
    • https://wunevebisa.weebly.com/uploads/1/3/5/3/135306556/9aa04f25f7.pdfIn PDF document text
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/liboxezijamu.pdfIn PDF document text
    • https://xogazusuguse.weebly.com/uploads/1/3/4/4/134479670/vusefu_soluvowivos_jibaxupakobapar_zokopoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5ff16af152f88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_606c4360e8e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_601a2cbb687d4.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/vaniviteneg-nanufigizizi.pdfIn PDF document text
    • https://widawukilifuduz.weebly.com/uploads/1/3/5/3/135398171/ranowos-xezatibirumomod-jesuvapog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikoborumun.pbworks.com/f/52669534894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26fdb8eb-3349-4794-a688-f64b44ad4328/gonapasadap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d57caf-f0d1-4580-8f98-0b2eac6cb9a2/sword_art_online_vrmmorpg_game.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144557514/25324464781.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/f/xagosalabibexunasebibovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ecff35-515c-494d-afe1-a73e2dce29dc/sample_resume_for_oracle_pl_sql_developer_fresher.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_off000174a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A8 5280 bytes
SHA-256: 2d3a052f2dbbd7a57028393d5a896c5b7e387b14b9232692c52be80eb9e1ec2d