Malicious PDF — malware analysis report

Static analysis result for SHA-256 3259e9d5b4c6e516…

MALICIOUS

PDF

71.9 KB Created: 2021-05-06 01:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d4760d014f54341cbce333c2e063696b SHA-1: 75b76328ef5e8d438f4442765e7c16c99a1f54bc SHA-256: 3259e9d5b4c6e5168c804f57a0376c554372c8d59fb1f738f31102e3f98d3103
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high concentration of them pointing to disposable hosting and using UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites.

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://midufefew.ru/strik?utm_term=what+is+definition+of+social+studies PDF link annotation
    • https://cdn.sqhk.co/pigexebobe/dJhauhe/super_stock_drag_racing_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/wih9kic/pockets_billiards_and_brew_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/iaDhhhC/98409697273.pdfIn PDF document text
    • http://tadolonelo.sportsontheweb.net/juduxebifewoxitonisi.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/MgiZR9N/dipson_movie_theater_warren_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/gqChhge/35131350672.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/5cjhebi/top_2020_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469643/normal_5fc7cd2847a93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd4103323c.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/j9hjge8/amazon_seller_account_uae_requirements.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/40765812252.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/hhiiijR/gigamafapefevakusinipipav.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/Smiieic/mysore_ambari_photos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40ba421-3354-4e7f-bb50-832ffc3a9e5d/bridgets_healthy_gut_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a49b493-14d7-4ed7-8a92-33728d5dd517/jibiguwakurunagepumewaxuj.pdfIn PDF document text
    • http://mizajasidan.epizy.com/bugonovarozetesijemaz.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/gisakuvivi.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/presentations_that_matter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ec254f-6406-4d43-9765-772ee49195be/suzavisube.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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 5024 bytes
SHA-256: 1f1d2e489e31c393bfd22ff43b9dad95152628bdf646d900c9ce26ed8c1530ca
font_01_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 11204 bytes
SHA-256: a196efc1f2b3434df03752baa23b8c718e73aee9c8dfdcabb96227f1c82763aa

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