Malicious PDF — malware analysis report

Static analysis result for SHA-256 432b7b037226435e…

MALICIOUS

PDF

76.9 KB Created: 2021-06-10 00:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 191916e8c3018d522c38b5da4f42bf03 SHA-1: 67d47c27f87a432757529df4d0b10cde84b18955 SHA-256: 432b7b037226435e00580c5f355a022f6d336a202490c8baf9a0a2d97a34f476
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a primary suspicious URL being https://chcial.ru/pbw?utm_term=khloe+kardashian+sydney. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or spam campaign. No scripts were extracted, but the structure and embedded links point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/pbw?utm_term=khloe+kardashian+sydney PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369933/normal_6022522e9665e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_602d2e137cd47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_606847191b92f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_5fc67b82177e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_600f329c612ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fd2e610e0611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_603fdac80d3bf.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/331bb6f2-80d9-4649-a9b2-ff6938d82d3d/the_iliad_robert_fagles_ebook.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/f/how_do_i_change_the_voice_on_my_bible_app.pdfIn PDF document text
    • http://maxasol.pbworks.com/w/file/fetch/144727575/18892671048.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/vespa_150_sprint_vlb1t_owners_manual.pdfIn PDF document text
    • http://lakobun.pbworks.com/w/file/fetch/144784218/50720985514.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/software_testing_tutorial_for_beginners_download.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/sbi_cheque_deposit_slip_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d190411-2279-4725-8aac-7a17015c5a31/supupuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92c6780-b42d-4eb1-831f-a8f199e1cafd/53229535684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103467ef-1f9d-4e9c-b748-245639a43a95/psalm_23_esv_commentary.pdfIn PDF document text
    • http://wekanivu.pbworks.com/f/chemical_composition_of_olive_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbd5beb-1716-4774-9837-5ecc4aa48d11/21358480936.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144411804/podebokaxebe.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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 4756 bytes
SHA-256: e4779775aa0158593631be918faf6d0110496ad12c7c0d84851a66e00fce93d9
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 11296 bytes
SHA-256: 571317ddbd66ac1a69c783002e3067e0c016e004d15f21124f5110b7ae300a4c
font_02_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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