Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25db3855fc47ea5…

MALICIOUS

PDF

80.9 KB Created: 2021-03-30 09:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aa05c146959b199934d1a3c5e7ce2dfc SHA-1: a53fb973516f472488d2c9d5b70691707505a330 SHA-256: f25db3855fc47ea5c8a3d665c7e452295880a6c870c2a26e0bb2f1e39431f304
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=criar+assinatura+digital+para+pdf PDF link annotation
    • http://bulakirip.getenjoyment.net/batman_the_killing_joke_movie_download_in_hindi_300mb.pdfIn PDF document text
    • http://avtoshtorki.shop/home_republic_chambray_cotton_sheetscgwz5.pdfIn PDF document text
    • http://getbuiss.online/185964611460oqga.pdfIn PDF document text
    • http://mixit.info/aleph_paulo_coelho_review6vhqn.pdfIn PDF document text
    • http://timurberg.ru/moluvaboralixsn7z.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/tujizokilijuwaxag.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/80161824947kvkno.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/89136977050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e045b91-7e32-416d-a40f-66d9f4363345/how_can_i_make_money_online_in_cameroon.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_7d2a850e630048c99300235cca27955f.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_0026036c15d84d0a96cce9fe92229bcb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03263b99-93c0-42c3-8fab-c023ed713a91/45780450212.pdfIn PDF document text
    • http://dijuvunote.onlinewebshop.net/hpi_baja_5b_performance_parts.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_c67242e4b7cd4022962716f87ffc3290.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7d799d-a24b-45c4-b8da-a66c47791d2b/where_can_i_get_covid_testing_in_colorado_springs.pdfIn PDF document text
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_0afb69f906c04ca284976d7b07d87c3c.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_3886d8e22cfe411197704a518706fcf6.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_2dfd2c26d55a47bb86e8067273ad3593.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31147edc-f191-4e6d-9942-72dd4ba65eb5/web_services_testing_tools_postman.pdfIn PDF document text
    • http://luvetux.myartsonline.com/rainbow_fish_book_storyline.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 5112 bytes
SHA-256: 810170e2b3aa657b93be32f943272eb6aec7a140247a5db16cecb2259ceee844
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 2092 bytes
SHA-256: df808ed687da2736c31fe5b987f1143c49f9753434bffb0b96cb099dff712ae1
font_02_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 12280 bytes
SHA-256: 6e7f4b003cf2657e726a3791fad2bf4a1ffbf42be6cc39e485aa66a1be96bb20
font_03_sfnt_off00012994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12994 2532 bytes
SHA-256: 2bc35ff6a689629b5ec3527ffdd2da7d54c0c5151e0fa9f7e5ff37cfa7cbbc15