Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81f44fb9f939699…

MALICIOUS

PDF

71.7 KB Created: 2021-05-17 12:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 17cb6e3e90b2352b2f51d3a0bef29a1d SHA-1: 52f7b6852d4761fb2a8c27eb2cf6d9a66f5a3f94 SHA-256: d81f44fb9f939699d2fa8abb7225cebfbb640ee051b566dc1addff1bd4df8321
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://nipisod.ru/strik?utm_term=manual+yaesu+ft-897d+portugues PDF link annotation
    • http://kinokaiff.space/754771049373c965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_605c2ea4d77ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_602213601b0cb.pdfIn PDF document text
    • http://world-wild-shop.com/gajitesixikejoeond6.pdfIn PDF document text
    • http://upsbox.ru/98740450422wfk8u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5ff437293854b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_6044deb05d707.pdfIn PDF document text
    • http://bionatur.space/fast_driftstalle_utomlandsxjwow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_601fe97fce689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_6021f25a83e1d.pdfIn PDF document text
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/xidado_manomowuzerado_lesozalujeru_fodorineg.pdfIn PDF document text
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/8bc771c.pdfIn PDF document text
    • http://goldotzyv.ru/gre_math_prep_book_free0gbow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_5fd2261e1dc52.pdfIn PDF document text
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/0cae6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_70a586a80af14b6f82aed422e27520c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1222e5-07f3-4664-97d5-28a902028769/parikutabuxeset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba4981e-23f3-46f3-8825-5ae784921e48/44665811951.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_990b78cf4c654dd3b8507e86dcec91e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b9fd9e-906d-4561-9a38-9e75bd0c460b/partial_differential_equations_for_scientists_and_engineers.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_f2e2d9039a694c88bf4ba5c43f5e7ba8.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_49551ea1ed954f42a8125d3f7920e9e0.pdf?index=trueIn 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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 5776 bytes
SHA-256: 48f92ffc2e7c9d192a7fa2847ad2498d56d1cdfa1ba439589df9f901bbf87b09
font_01_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 11840 bytes
SHA-256: 37d981df4a7c8b000f64e15a07bb5240f3b98cdacc2c1f4c984d661cda550cff

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