Malicious PDF — malware analysis report

Static analysis result for SHA-256 141e952767429a4a…

MALICIOUS

PDF

66.6 KB Created: 2021-04-01 15:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de7e8851c12c0bf9174317c63c33eb5e SHA-1: fed5cb9b479ff50762ade3c8980a1d5dce00e0c4 SHA-256: 141e952767429a4a2ff177db228d9b1e565f8798e227f4dbbab61d5f6e7623e5
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('pelibifir.ru') that is likely used for phishing or to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent by identifying a link farm on disposable hosting. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8274

Heuristics 4

  • 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
  • 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://pelibifir.ru/strik?utm_term=how+to+train+for+rock+climbing
    • https://cdn-cms.f-static.net/uploads/4368468/normal_605db8fe80592.pdf
    • https://cdn-cms.f-static.net/uploads/4500889/normal_6055330545b62.pdf
    • https://cdn-cms.f-static.net/uploads/4366351/normal_60138698913e8.pdf
    • http://fitnesspack.net/nilunavopotuvejegewipovamrwdd6.pdf
    • http://help-lnstagramcopyrights-verify.com/watenlu14v.pdf
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5fce58f829a99.pdf
    • http://kozevajalun.22web.org/rugby_bulking_up_program.pdf
    • http://losinglotterynumbers.com/farkle_minkus_age16tly.pdf
    • http://megantv.site/guided_reading_lesson_plans_for_chapter_books7lm92.pdf
    • http://xixabibalusuzip.22web.org/migepata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dolufin.epizy.com/nesidawaminer.pdf
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_241cbfff05b94cbd909231e51e1142f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81ac82e9-30ee-4aa7-a029-676fc2a8b885/how_to_increase_a_shape_by_a_scale_factor.pdf
    • https://s3.amazonaws.com/setigafat/android_symbol_appearing.pdf
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_064eeaaf52d7499dbad82b8310de3f10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e079831-7338-44b9-96dd-90cd457c9437/nakewovotisovesul.pdf
    • https://s3.amazonaws.com/xofalepelala/autocad_dwf_viewer_free_mac.pdf
    • https://uploads.strikinglycdn.com/files/91991202-0321-4d37-a880-6dd0a465ecb0/98958254462.pdf
    • https://uploads.strikinglycdn.com/files/d078dabf-e77d-4279-b81b-ba4a11c8b535/matadokowud.pdf
    • https://uploads.strikinglycdn.com/files/146e22fc-d725-4b9f-9d1c-0688b1c0be2c/hp_laserjet_p3015_printer_51.10_error.pdf
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_b7fb58f4957d4016b0a187363a7808b4.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f441.bin
7007768be3fda5f2d04e68392acb7b25cf7d9ad16de85692ce0e1fdeedb014e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 4948 bytes