Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a89ddc53ecfa2f8…

MALICIOUS

PDF

73.4 KB Created: 2021-02-24 20:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2b3498b3f486e4eaf693fa57e1c01f57 SHA-1: dd5ea6a5ec22d07511a9fdd5ab29b5840047ecca SHA-256: 4a89ddc53ecfa2f865771f40952e5d45b8ed57c33c23f9b049a091503d59040a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://crophysi.ru/strik?utm_term=how+to+skip+count+by+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495271/normal_5fc83e1a8dd3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_6019fcf6408f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_600c76531d321.pdfIn PDF document text
    • http://ontrade.top/nipuvimijowotouyoag.pdfIn PDF document text
    • http://9gusevshop.space/how_to_use_maxtor_external_hard_drivew5y2a.pdfIn PDF document text
    • https://cdn.sqhk.co/bujomuvi/gxMdvcY/costume_contacts_sold_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/ezS1eav/crossword_puzzle_maker_with_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/jgifYhh/76485776534.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/31120719557.pdfIn PDF document text
    • http://gratoraama.space/741269887229rzcu.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/3jdiips/usb_connector_pinout_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_60220ab8be6f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5fcf3fc105f32.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/19632016635.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/gegatisejegeragoku.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/jhiHngc/haunted_run_down_houses.pdfIn PDF document text
    • http://musc-media.xyz/cms_telemedicine_versus_telehealthc1bf9.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/93242434850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvarijes.atwebpages.com/how_do_i_put_my_maytag_washer_in_diagnostic_mode.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/vazuv.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/95089183209.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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 5028 bytes
SHA-256: 613da4fe54607e3f567feddf34ee3680beb7b6df7e5e7668c8634b629d64e548
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 11216 bytes
SHA-256: 0e78da6ca262eddeaf6ab0e13cb332eb9c7279b92efa25781ffa362d415828ef

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