Malicious PDF — malware analysis report

Static analysis result for SHA-256 0054a4bff19f4fbc…

MALICIOUS

PDF

92.5 KB Created: 2021-05-04 06:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9ee68fd6f4847009bcd596aeff27733d SHA-1: 9dcff2d16b10ca5dde5dd97f80337e4215d00ef8 SHA-256: 0054a4bff19f4fbc4f1b42e88d1c4a05039d62ff2b6460bd07d9d462d1ea7f7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/strik?utm_term=fifty+shades+of+gray+2018+sub+indo PDF link annotation
    • http://peguxukeziku.sportsontheweb.net/biochemistry_books_free.pdfIn PDF document text
    • https://cdn.sqhk.co/repejuvovod/NXjhasC/75976163162.pdfIn PDF document text
    • https://dagatofolake.weebly.com/uploads/1/3/0/8/130874029/517669f.pdfIn PDF document text
    • https://pekizaworix.weebly.com/uploads/1/3/4/6/134657316/1661736.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/22457140848.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/b669cd.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/probiotics_introduction.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/fitumewade.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/idgjghM/kolo_a_color_maze_puzzle_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/ggjjKig/guxomukapazene.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/nopovetaxonoraxakogexijir.pdfIn PDF document text
    • https://jupiretuvivu.weebly.com/uploads/1/3/5/3/135383394/3340917.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/lgfgfgj/55385725839.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/talir.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/dinip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paxexij.rf.gd/halloween_math_problems_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/28521000827.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/amravati_express_platform_no.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/brother_hl_l2360dw_toner.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/cartoon_network_app_free_for_pc.pdfIn PDF document text
    • http://lobakixadob.epizy.com/makusakitujugog.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/72347580215.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_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 5852 bytes
SHA-256: 0cd47222c19a82aff9246ca0ab599325a0f6efec74fcca79095301dcdda88c68
font_01_sfnt_off00013d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D31 11520 bytes
SHA-256: c12616c564aedbb1a15cbc1fb91eca87134bc5ef4b4184f6b52336c9180b442d

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