Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69cdd05e2bdf85d…

MALICIOUS

PDF

76.1 KB Created: 2021-01-21 10:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 53e3b9e894d2819e8bb1b875a30ea341 SHA-1: 4597b414f4691ef22a4598aaa1cbbbdd907f7e68 SHA-256: d69cdd05e2bdf85de0688450eb44b3ef3109170e96b95bb6a8a13f04749e2ab6
186 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/123?utm_term=employee+of+the+year+nomination+form PDF link annotation
    • https://cdn.sqhk.co/wuwovodegi/heEgfgc/glory_road_book_characters.pdfIn PDF document text
    • https://vidijizuv.weebly.com/uploads/1/3/0/7/130776341/bajixudozivib.pdfIn PDF document text
    • https://site-1179000.mozfiles.com/files/1179000/lasowav.pdfIn PDF document text
    • http://velixone.66ghz.com/writing_styles_fonts_free.pdfIn PDF document text
    • https://cdn.sqhk.co/losegiro/RO0hiyl/84463003114.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/ef083918.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/4gijcja/color_by_number_addition_and_subtraction_kindergarten.pdfIn PDF document text
    • https://site-1176433.mozfiles.com/files/1176433/photo_to_video_maker_with_effects_free_download.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/kuwexexowipulexopuv.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/jgTLgfC/graphic_design_desktop_pc.pdfIn PDF document text
    • http://wezenilokiwuv.iblogger.org/lta_appeal_letter_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/hg6UgeA/dreamer_lyrics_martin_garrix.pdfIn PDF document text
    • https://xekuvezenigut.weebly.com/uploads/1/3/5/3/135346982/lapuwonofa_ruwesaxibuwap_vusaxegujajaku_zitisovalod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/formation_chauffagiste_toulouse.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/nawominesisiv.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/mineral_hemoglobin_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/zanalokodabep.pdfIn PDF document text
    • http://kebowikosu.epizy.com/valkyrie_connect_apk_data.pdfIn PDF document text
    • http://kagufunoziwezu.epizy.com/89950333974.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_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 5024 bytes
SHA-256: c5b8f5bcef3a594c6011fae0ee2fbb3d9e81959ee9fd40f9d32e63efd2dbfbd9
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10492 bytes
SHA-256: b76dc1b5bf2339ba4afc0627779ad359fb961afdf70affc1ef303cdfc047c6d5

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