Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39efc090eb9e71e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 13:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8452b1df556f156910e971bec57bea63 SHA-1: 709507c6b81132f570fbe61cb45a3745a356f8b7 SHA-256: a39efc090eb9e71e9f6c84ec20d15677ebab13f4b31a74921f1a038dd99e6f02
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/award?keyword=bye+bye+blackbird+pdf+real+book PDF link annotation
    • http://beviluxenumiliv.mywebcommunity.org/apprendre_le_chinois_mandarin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_601bd1c488c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_603272ed51773.pdfIn PDF document text
    • http://fetisaletom.iblogger.org/the_ancient_secret_of_the_flower_of_life_review.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/41245963244.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/beta_ossidazione_acidi_grassi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_602824a363072.pdfIn PDF document text
    • http://badenodovaze.22web.org/bukuberepalezafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debumiputun.rf.gd/lady_gaga_shallow_piano_sheet.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_96590c497bf64cdbb63e36a42d7ab449.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d1f2890-02e5-47dc-a074-d0acc27d8a89/types_of_research_methods_in_qualitative_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e457cf9-a112-4180-8dbf-7a7040ce079d/lg_tromm_washer_and_dryer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa823fc-506b-4f28-9812-2be1d19edea0/jubemexuxitugerajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0423b90-d117-4799-a3b2-7e50f5e1db4a/how_to_toast_frozen_hot_dog_buns.pdfIn PDF document text
    • http://bibobega.epizy.com/42252121975.pdfIn PDF document text
    • http://japusorusepex.rf.gd/85207883555.pdfIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/isometric_exercises_for_abs.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_390fde07c563484e9b8efa663dc56dec.pdf?index=trueIn PDF document text
    • http://tanofekomom.epizy.com/pazebasube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704224ac-38b1-4c66-aaf2-82070f5365c7/39780733042.pdfIn PDF document text
    • http://tokipobobanokab.rf.gd/the_ancient_magus_bride_ep_5_sub_ita.pdfIn PDF document text
    • http://bideliv.rf.gd/annamalai_university_dde_convocation_form_online.pdfIn PDF document text
    • http://fosufikitovirir.rf.gd/90630477862.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 5328 bytes
SHA-256: 8bd4c3bc7bc6198cf121748729a86a72a5b20d8583f64fa0a0396874a1e8322b
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10980 bytes
SHA-256: 2241828b3ef096898f498e00a8571bf2886c59c549ec18e1337762d4b5e5b87f

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