Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fb5af91e6cef89…

MALICIOUS

PDF

84.5 KB Created: 2021-03-25 12:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 95316044cc95ef67c824a01356c05d1e SHA-1: 9302c64e57390020af6998e1c1398b97367c6983 SHA-256: 24fb5af91e6cef89ede11625dd0e48374ee1661ff7b94535d61f9758a95c0b5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://bologen.ru/wix?keyword=briggs+%2526+stratton+725ex+parts PDF link annotation
    • http://lajodibibodi.getenjoyment.net/definite_and_zero_articles_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_604ad6c4ed62d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5ffcbdefc9250.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/31323139246.pdfIn PDF document text
    • http://kushtanash.ru/basic_pharmacology_for_nurses_17th_editionh5wzz.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/biochemistry_textbook_berg.pdfIn PDF document text
    • http://sfhgfje5df.xyz/mivanoluresaritijoxaloxujn5hfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_5fd2d89675994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_600022b6682b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420610/normal_5feda36fc09c6.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/ghXF7A2/future_face_palmistry_app.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/atrovent_davis_plus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5ff0c4ac3129e.pdfIn PDF document text
    • http://afracheat1.xyz/bangla_sad_shayari_video1eswe.pdfIn PDF document text
    • http://rumepado.mypressonline.com/farmacos_androgenos.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/fvVzify/fisezupunomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0f7e258c-0b50-4c1c-bcad-e1e7910145a9/18935260447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742900a7-7e11-4622-a1ef-4ef31fbb40ae/14541495061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a81b2e-a1ff-4591-9ea8-23ae233b6d3e/3274700098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d368cc2-4578-433d-a0bf-90ea5244d0c0/7265591223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/166db4e1-6f7e-412e-b8ec-10ae8be0411b/60725672933.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 4028 bytes
SHA-256: b6dfd5edf638f95b192ec9dc08a3838ded5b04d5a31425bc8de1dbab2435f47c
font_01_sfnt_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 10844 bytes
SHA-256: 23c8f11826ed2e5e06de2ddbacfc6a1b902485bfce7b781a0912e4cb3452c27b
font_02_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34