Malicious PDF — malware analysis report

Static analysis result for SHA-256 11893fd6d26c41c8…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 04:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e0135f2a420684a3777cf99d1374617 SHA-1: 10c53fc924ae6449de736207c4df933630b9ccee SHA-256: 11893fd6d26c41c815d8bd441723119d476c32de9cf39378e23326dee1aee739
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content.

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://xezojetit.ru/123?utm_term=board+games+templates+free PDF link annotation
    • http://usacreditscore.info/marketing_manager_high_school_requirementshunaz.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/climbers_club_pembroke_guide.pdfIn PDF document text
    • http://mufubiguwejewif.22web.org/77273169797.pdfIn PDF document text
    • http://pixxel.life/america_s_got_talent_2019_all_performancesidcaj.pdfIn PDF document text
    • http://italysummer.space/york_service_manual_160.54-m17sh49.pdfIn PDF document text
    • http://usene.xyz/shoei_neotec_2_visor_replacementye3ck.pdfIn PDF document text
    • http://safetymirrors.xyz/18081229609vab37.pdfIn PDF document text
    • http://eagleaff.com/reference_code_s0200_charterw2tsn.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizajo/xh5igPu/cara_menggunakan_multimeter_analog.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/gjghhiF/shooter_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/iegfxsw/govuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_84a6f2a936764deab6f6dbe7532149c5.pdf?index=trueIn PDF document text
    • http://joriboka.epizy.com/kangna_song_free.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_e4abfa577be34b8f9c42526dfdcacba5.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_a0dae57bce3b47e69cc92419ee179c73.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_3f416949e8814776a8bf2c13bce43263.pdf?index=trueIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_b18710fb8dbe4d75a086140cca954fe1.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_df896bb3a8a2468385d29df453198f69.pdf?index=trueIn PDF document text
    • http://fozeworot.rf.gd/b_tech_civil_ptu_syllabus.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_1b40effa3af54bd4ab4a81af4ff59d97.pdf?index=trueIn PDF document text
    • http://nekaluro.rf.gd/allah_names_and_benefits.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_6297a20a75b746f7bcea1aafcb2996c9.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_aff4aca4ac8c45519573c6dda343cdde.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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5408 bytes
SHA-256: 470f07782c2f4fb95ddc991f6c6e507a0d8ad185727b43cc8c08d9da39914e66
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 10300 bytes
SHA-256: 2f5fd19f36f5a3ecc337dc7ef705f02057e49317c17801bc02705ac1f08b7343