Malicious PDF — malware analysis report

Static analysis result for SHA-256 50abce532a4f1cf9…

MALICIOUS

PDF

91.4 KB Created: 2020-12-20 11:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f05d3004a67413529ac32367ac4336fd SHA-1: 1f621d9fb909acc954b5185bd277173b803935bc SHA-256: 50abce532a4f1cf93fa06047c728263da21784466ddee37dd83c038c393c96d0
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_UTM_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, indicating a phishing or malicious intent. The embedded URL, https://trafffi.ru/strik?utm_term=craftsman+ys4500+parts+manual, is likely used to redirect the user to a malicious site. ClamAV also detected this file as Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/strik?utm_term=craftsman+ys4500+parts+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f8d6efa26858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_5fb757e412f8e.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/fogetazox-rewiwinu-kuvosevaxanisif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5fd99dacee9ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374175/normal_5fcef3163d1e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5f9aeb7d3e7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f87f8e9a74ec.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/nazekisigiduz/typing_games_japanese.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/silubafawovoz.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/harry_potter_theme_recorder_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/hssc_admit_card_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/india_cabinet_ministers_list_2019_download.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_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 5408 bytes
SHA-256: 69d549eacab595f2132b6907aa16ffdece4f332103fddc23c450830b6d8f178f
font_01_sfnt_off00013a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A87 11452 bytes
SHA-256: b8de8f86dfdc83aadc2b1a4565b12deef500ef9f076e09182741621d084b6896

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