Malicious PDF — malware analysis report

Static analysis result for SHA-256 5788b822df1cf259…

MALICIOUS

PDF

77.2 KB Created: 2021-03-07 05:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 05040456b5c4aa4b4f244ae65cdf9a97 SHA-1: 68549ddb8e80bb702a3ac529b2a3784e570f54f5 SHA-256: 5788b822df1cf259fffe99c7bb03bf7806c5178a681cb96e0164be9d14313366
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=republic+of+doyle+season+3+episode+2+cast PDF link annotation
    • http://nawukebakesejid.iblogger.org/anamika_movie_song_in_320kbps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_603e35572e1b9.pdfIn PDF document text
    • http://vikorurapufor.iblogger.org/bisuposepedeviwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_603b938dd6ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_602c506bf37d4.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/5176814.pdfIn PDF document text
    • http://jebewif.22web.org/banno_teri_akhiyan_song_mr_jatt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_6023bc69b7269.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/gozofele14ns5.pdfIn PDF document text
    • http://vienvozvrat.site/applied_partial_differential_equationv0ps.pdfIn PDF document text
    • http://webmastervlad.ru/40637211091xxpzb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368977/normal_5fdf6f48bd420.pdfIn PDF document text
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/6f4a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_aead4e2452e2450f9b428b4a7820d0a3.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_1edeca374d2d4e7fba5ed578b5a4fc12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edd53f1-6320-4563-bcfe-b419eb47af2f/fender_passport_150_pro_portable_pa_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8cabed9-4c90-4391-965a-2ca048609997/what_are_the_functions_of_rti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a933cd8-e66b-4d27-aec4-2ead947b19ee/mapupomuxazazidak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8115b5c6-1e09-4f94-b2f0-ca6b2f977271/is_curved_tv_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be47bb61-c122-420f-98f1-488531b8ba55/lista_de_verbos_regulares_e_irregulares_en_espaol_para_imprimir.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_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 5596 bytes
SHA-256: 21c76c4149dd100034d9da7b0a2a24b1c0c488708a4b86749d29020a85b460d1
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 10848 bytes
SHA-256: 34d0c5b03a605cc3192423b95e8854ecd12a2b16c139117f8dd8fc5174971062

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