Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dd404d8ab74c3e…

MALICIOUS

PDF

92.2 KB Created: 2021-04-25 21:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a7f78e7b6d3c110ef00ced594479367f SHA-1: c65e7e7dd4e13f52ef99d5c1cae4b247d8bc7215 SHA-256: 07dd404d8ab74c3efd02848ddd9ac3a3149cc3bc2243fd5e189706286f9a506d
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 0.9998

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://ponafet.ru/strik?utm_term=how+to+calculate+area+of+triangle+using+sine+rule PDF link annotation
    • https://cdn.sqhk.co/kiraxozi/jbmNMiQ/business_card_maker_free_printable.pdfIn PDF document text
    • http://precabinets.xyz/technical_report_format_engineering_samplexvaw5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_606e3e38024d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_602434581cdec.pdfIn PDF document text
    • http://dronextactical.xyz/big_green_egg_accessories_xlqxwy6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5fe4fd7900c86.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/eBmjicE/fibomolalevajir.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/element_elefw504a_tv_stand.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/igigczl/xalikojogitofakotapek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_6042d72dcbfaf.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/hbiejcY/46849552318.pdfIn PDF document text
    • https://cdn.sqhk.co/zomuzesirira/tLigNAi/big_mouse_pointer.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/steven_s_skiena_the_algorithm_design_manual.pdfIn PDF document text
    • http://umdtheatre.ru/nvidia_geforce_7300_le_driver_windows_76xmx8.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/us_off_road_army_truck_mod_apktbzhp.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/2547851230.pdfIn PDF document text
    • http://supportcopyright.net/kitchenaid_stand_mixer_5_quart_whitea9tlh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_6006bf5fd4dd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newotev.rf.gd/didesuj.pdfIn PDF document text
    • http://guwaduroredidaj.rf.gd/manufacturing_consent_noam_chomsky_book_review.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_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 5104 bytes
SHA-256: 8f825abf21ee5cb9108391f5bd83c997bfe12c2a0c6397da3cefbe4d0083c248
font_01_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 11776 bytes
SHA-256: eab96326873f3765b77ac9436c665f70c7beb511b5ba1ac89b22f91d83ed7608

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