Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb000b1acae36b…

MALICIOUS

PDF

78.6 KB Created: 2021-03-05 08:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fbd614c8762d19103de26a8a8083b4f6 SHA-1: 15a0cb8ef635595f75066d79fef5650b2598c540 SHA-256: 9dcb000b1acae36b8ad2b0ca07d33a696fe94235dfcc6dc3c62cdbc050a64631
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a significant portion pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://vilenefex.ru/123?utm_term=will+having+sex+while+pregnant+cause+bleeding PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369640/normal_5ffcba1563cd5.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/giicFid/ribuluzunuduno.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/29e270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_5fda3cca840bc.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/43609179958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464735/normal_5febd17d203ff.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/5151000.pdfIn PDF document text
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/dotajita.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/98453267736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6009d7d1ac505.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/8a31d363f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371553/normal_5ff683c5bc764.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/gwhifgd/microsoft_intune_managed_home_screen.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/24928686590.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/gfLYPkl/street_racing_3d_hack_free_download.pdfIn PDF document text
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/0c256ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuroruwe.myartsonline.com/kixogijegetemu.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_d5b56fa111b244eebf16bb8405560ea2.pdf?index=trueIn PDF document text
    • http://javozajesaretu.epizy.com/mafia_3_guide.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_6aae118823ec4262a591999230bbdfce.pdf?index=trueIn PDF document text
    • http://doluguki.rf.gd/tipos_de_comunicacion_interna_en_una_empresa.pdfIn PDF document text
    • http://kolenexe.epizy.com/disclosure_of_lobbying_activities_continuation_sheet.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_69ed782ee8374268bdfc43de3b5637d3.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_062a0c00182a41bd9f1f2f62117b4f5f.pdf?index=trueIn PDF document text
    • http://sapifux.epizy.com/92869085603.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_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 5708 bytes
SHA-256: 07e6f2976471ae5e89e35f0212ff5e90f37484362ecb785a18f78db4c54e69eb
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 10996 bytes
SHA-256: bd367c1d27c30462bb44e0cdc3f5225cd3ae4b02e54db96c60a9eb44f809c3d0