Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e09a27b0e2cf11…

MALICIOUS

PDF

76.0 KB Created: 2021-06-01 04:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6095149e0f421585a37980f94af36879 SHA-1: e863a58e786f6e79417228837893e28694b6e12b SHA-256: 52e09a27b0e2cf117e66f671c3e260bdf427fbf73b1ee4f3ead3a4020c5cfa30
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable domains, often used for phishing or malware distribution. The presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://synerhu.ru/pbw?utm_term=bsf+constable+tradesman+admit+card+2018 PDF link annotation
    • https://tumizoma.weebly.com/uploads/1/3/2/8/132814974/0d898fb275bba61.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/judimubulixu_sixugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_5fd315437253e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_6008b2f6d9858.pdfIn PDF document text
    • https://zapoxafejomazex.weebly.com/uploads/1/3/4/7/134745353/bewol.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/676c785.pdfIn PDF document text
    • https://kabapavubume.weebly.com/uploads/1/3/4/7/134742816/ruvirubuvijuwovexir.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/fipegerixasob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501509/normal_605f6c371fc74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fde58c1a0741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_6033394726522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_602cf348a9954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_603be01e6b644.pdfIn PDF document text
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/56f991cdaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_605a203534bf7.pdfIn PDF document text
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/85c82f.pdfIn PDF document text
    • https://rabibenexu.weebly.com/uploads/1/3/5/3/135319922/dotuwakanoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_60540ef15bc45.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/d1c3e670-6063-4af9-bfc7-718c63d883e4/how_to_fix_white_knight_tumble_dryer_door_catch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd71666f-f678-4cc9-94ea-037fed69eb39/what_is_a_textured_ceiling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b58a05-fc9c-41d9-b174-e5027e51f396/libovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf10987c-3bda-42b0-9ea2-f1b4548733ff/94492339261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63428929-3c9e-4877-aec6-56d5f4855fa8/pasar_de_gramos_a_mililitros_con_densidad.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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5876 bytes
SHA-256: 7f97c02002dc82401e776f149e31ab3e582c179c39f6c81db3c57f4c0da394fc
font_01_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 11028 bytes
SHA-256: 4b2d230fddb7e78fbe835a126757b11856ca3cc7f0a69f5f1af3c8c9ce8dd89e

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