Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eba076916c6cf3f…

MALICIOUS

PDF

85.4 KB Created: 2021-03-06 18:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d8b4ecaa534e0fa576dbc564d8975935 SHA-1: 26dcf6839a0a1698dd5cd3b20fb9d59d56dd38bd SHA-256: 4eba076916c6cf3fc8eeb9e6856066981d6e08847d4ac340f764a5e6c835f0ee
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating a malformed exploit stream and a high-risk redirector link, suggesting it's designed for phishing. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload.

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://maypoin.ru/aws?utm_term=summary+of+a+confederacy+of+dunces PDF link annotation
    • https://cdn.sqhk.co/jozojijejip/BDjfge8/wallpaper_engine_zombie_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/2gcTheM/wugugaketo.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/bggifbJ/snowball_fight_1896_colorized.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/ikBjdhh/crashlands_wiki_arrangement.pdfIn PDF document text
    • http://lasns.fun/6th_grade_math_review_testdgh2h.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/hGculjh/destiny_s_child_wikipedia_espanol.pdfIn PDF document text
    • http://todayshop.website/wupaxajedeitaj5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5fe2e0a1d22b0.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/NhdbihK/mujivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_602714ab2c9d3.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/a8245508-c7a6-4cd2-bf13-11dc01c3d27d/56311877668.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/10539148605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948d173e-b80e-465f-afc8-090277267176/55683252733.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/descriptive_and_inferential_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/babu_rambabu_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/47893237306.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/finufewidewafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f120578-73ee-47ab-97bf-0fad6fb84309/persuasion_jane_austen_full_movie_2007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015368eb-e656-4983-abb2-9a5c99b6011f/zuxiwo.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_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 5340 bytes
SHA-256: 0233d4057f63fa25ed1acdd68bc4c068e295d909f9b605eb6ea07bff710b1c10
font_01_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 12108 bytes
SHA-256: 63c34f5333fc69bd6efeeefaadf08d06970121138c1e2ef86d829bdd119dc99d

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