Malicious PDF — malware analysis report

Static analysis result for SHA-256 2687bf4c3f361ada…

MALICIOUS

PDF

89.0 KB Created: 2021-06-05 07:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 90e3098f4220e53008d70f5b15a84589 SHA-1: 678e9b843f7a2d684d916f4526cdbb5811eaae06 SHA-256: 2687bf4c3f361ada8456f70cff7820226e40762a31f9ca59145b31e7b716d0cb
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically pointing to a domain associated with link farming and potentially malicious content. The PDF's structure and the presence of external links suggest an attempt to redirect users to harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/123?utm_term=js+advanced+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401711/normal_601bc8f8a4c6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_600e4f0e03bde.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4382949/normal_60afe6bd46742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_604b24e650bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_606004a857a5c.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/e75f6ff0-665f-4a9a-9754-28a049c62bb8/el_caballero_de_la_armadura_oxidada_anlisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d80ec8-e214-4736-8357-3d506c5f98ed/how_to_write_a_textual_sermon_outline.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/wiwimixabuvobobaj.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/65544015731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb53764-95cd-4472-ac12-72cd9fc812d8/95908103664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bea1110-a809-4582-87f3-a0e8d7cd1209/panasonic_kx-tge270_factory_reset.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/how_to_calculate_compound_interest_on_a_loan_monthly.pdfIn PDF document text
    • http://vedufid.pbworks.com/w/file/fetch/144510672/a_practical_english_grammar_exercises_1_answers.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/new_england_firearms_pardner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d4bd0a-b6de-4b7e-aaae-df1df2c0a0a6/dogewemuwoxowiriwomenaw.pdfIn PDF document text
    • http://favixose.pbworks.com/f/how_to_sell_to_a_business_owner.pdfIn PDF document text
    • http://nafidob.pbworks.com/w/file/fetch/144623055/does_metropcs_have_senior_discounts.pdfIn PDF document text
    • http://nipekari.pbworks.com/f/what_is_a_good_base_for_laying_pavers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccabe125-69b5-43fa-a0d5-72328a1365a6/treasures_spelling_practice_book_grade_5_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c00eb12-795b-478b-bca8-65a5b96ecb8b/how_to_use_m3_smart_led_unisex_band.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/f/vaxorezapukaberil.pdfIn PDF document text
    • http://mokapuv.pbworks.com/f/noxaw.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144536703/66662562221.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_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 5080 bytes
SHA-256: 31a4b4d01dccf9f88d451cc0d5cbd44d39e231d31cc19195b42bc30986214703
font_01_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 11408 bytes
SHA-256: b3e2d7631a38a2f3d1119f8a3fb8a4969bfdb399450864f2991fb13ed52363c0
font_02_sfnt_off00014875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14875 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333