Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86abc5ea431b760…

MALICIOUS

PDF

79.8 KB Created: 2021-03-05 18:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7280095d325e58989eedb4e9234c920f SHA-1: bd3f56b15d3b36130d11838e80a35030be7af4b0 SHA-256: f86abc5ea431b76017d7bb5a121869ae29ddf58176e35ae73fd5d2f2ba42b972
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards 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://nipisod.ru/wix?keyword=manaless+dredge+legacy+2020 PDF link annotation
    • http://logefekur.22web.org/himnos_mormones_espaol_para_escuchar_el_faro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_602702cfe3c74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368978/normal_5fdfc49b7f52e.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/8jbWgh0/8286140240.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/satuzajeneretud.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/25244307754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_603d4d8108ec7.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/zumedokixer.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/dgf9hak/jopigamokaselapafuzuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5fed9a70d608c.pdfIn PDF document text
    • http://sudedelanefozuk.66ghz.com/phonics_workbook_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_6031c57b57d20.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/divamelololifip.pdfIn PDF document text
    • https://luboguti.weebly.com/uploads/1/3/0/7/130739177/dilobu.pdfIn PDF document text
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/f51cf45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuzazepixo.epizy.com/65552919304.pdfIn PDF document text
    • http://wevevaviz.epizy.com/command_and_conquer_renegade_full_version.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_d03d1cebfda94b82a2d464a1ea996e7e.pdf?index=trueIn PDF document text
    • http://jemibare.epizy.com/rukejujez.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_a2eca975ad274ef2bca4949897156553.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_3373458a02184cd4b79c69f073f41dfd.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_c38580b58c054134a49ceded7c5dfde5.pdf?index=trueIn 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_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 5488 bytes
SHA-256: 9e4e4b177ead010f794c57cd348e227c22ecc8d761fdb1f8824f1a800f1bc526
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 10864 bytes
SHA-256: aea8a1c63517c4a055ea13148b4f41e2b7e010e2c9ca30b52376a8dc2dca2c41

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