Malicious PDF — malware analysis report

Static analysis result for SHA-256 2710eef8bf2b59a1…

MALICIOUS

PDF

80.2 KB Created: 2021-03-16 11:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5fce3724a64b60adbc88a0cd5af39652 SHA-1: 2c6760d535f2a32c6217e40e86b1c20c8a1eda07 SHA-256: 2710eef8bf2b59a1285bad314675db1dc327ce0460c91976251b327fe064c1ca
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically designed as a link farm with a 'how to repair microwave turntable' lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://gimoguvi.ru/strik?utm_term=how+to+repair+microwave+turntable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393883/normal_60367471555fb.pdfIn PDF document text
    • http://babobekoru.66ghz.com/gogipid.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/gHgjNhd/83465236726.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/belajar_menulis_jawi.pdfIn PDF document text
    • http://dombitarf.ru/pacair_range_hood_installation_guidep544q.pdfIn PDF document text
    • http://lolkek.xyz/wavefront_obj_models_freeys27x.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/fiiflhc/md_acne_face_mask_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/DFQ9jaF/pizefovaxodaxemege.pdfIn PDF document text
    • http://mamontov-net.cc/22507070321ivl66.pdfIn PDF document text
    • http://classkaod.ru/uniformly_accelerated_motion_model_worksheet_3r1f14.pdfIn PDF document text
    • http://wavarev.22web.org/naxebawuvoluvexumele.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/ER0kihz/crazy_bowling_team_names.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/pezigewilafujuvogaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_602c229050c25.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/avery_5160_template_margins.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/gofitufukurujepobafeli.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/6ONhdje/36853981195.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417313/normal_5ffea0d41dd50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5ffa34fb64640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_dc1ed267ac834ee9809a39396be5ef73.pdf?index=trueIn PDF document text
    • http://kiwozoma.epizy.com/wizegitutewede.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/58702842650.pdfIn PDF document text
    • http://bukulifuxevet.rf.gd/ciencia_ficcion_cuentos_cortos.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_9b478e6a11cc4f0288381a40b8c612b0.pdf?index=trueIn PDF document text
    • http://genolewedusu.myartsonline.com/bacillus_subtilis_taxonomy.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_96cc26227b444db187818edac12567b0.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_f27259392df84e51b04b3723ee0707d4.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_d7f92af30698450886f83e57d57598c9.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_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 5152 bytes
SHA-256: 425053f081ba90661b927cee5c25eef27d9f5820a0ad19f183d668be1bc787c5
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 10640 bytes
SHA-256: 032e27d3e9b5e999a0ad0f51d47ad075afdc8cb2b001f9488d9bfe64b9c0dae7