Malicious PDF — malware analysis report

Static analysis result for SHA-256 434444f39772235c…

MALICIOUS

PDF

69.0 KB Created: 2021-03-23 23:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 590cb4c1936ca63e1f4089c78eb28d4e SHA-1: 64259c9369221f5c15985116c4be91de0649e506 SHA-256: 434444f39772235c0efec8210d38d07756c12863a1577433d32e0eea5e28a0c4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://soxebez.ru/award?keyword=human+brain+coloring+book+pdf+free', suggests a lure related to search engine optimization or content distribution. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' and ML classification strongly indicate malicious intent, likely to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/award?keyword=human+brain+coloring+book+pdf+free PDF link annotation
    • https://rosokejasos.weebly.com/uploads/1/3/1/8/131871530/nekerapewe_repubowejigux_xewuvesuxi.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/xfinity_x1_box_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/iheiijh/stack_tower_jumping.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/biropupu.pdfIn PDF document text
    • https://cdn.sqhk.co/wetiniwem/gfgcOsW/950670000.pdfIn PDF document text
    • http://nowefatot.22web.org/rinnai_gas_wall_heaters_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/8iinFij/ferire.pdfIn PDF document text
    • https://pofunowiri.weebly.com/uploads/1/3/3/9/133997400/832e685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivikonalijuto.myartsonline.com/jj_benitez_caballo_de_troya_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d84ac6-a788-470b-9450-a6dac8ed2dda/kusaramigoxudov.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_2183de3ed17441f1b09ca2b6df2c3470.pdf?index=trueIn PDF document text
    • http://gorevifero.epizy.com/tekewupagaxuxutefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3915daa3-dd41-4435-944c-b3ac8139f51f/legal_dictionary_online_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9305109-5a00-4616-a84b-1bc519ffe0b1/lezisinore.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_2993fab8974a4c9fbad9c09c4bbc04d1.pdf?index=trueIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_954aec51c39d41e2b23ae6e2bbface3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42c339a-73c5-4412-a00a-0508ebdd5c55/53523792467.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_44f80d56e4354403835125f3e63069c7.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_f4a7c9844520410090e3d1ca9a6f4d08.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_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 5460 bytes
SHA-256: d6b28cb1d865bef4ece8e7951a2cf9b47e8443f45b8dfc49616688ec208a6329
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 10196 bytes
SHA-256: 373097646c6483b0a967b4625d04edabad3d400a39d7440f254bbdbfa29f49f7