Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcda32211b020946…

MALICIOUS

PDF

76.0 KB Created: 2021-03-08 12:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 20f8199ce401ba52fd2046108716e3cb SHA-1: da5bf47f3d9a781b006620e7f51d4f77677f3f84 SHA-256: bcda32211b020946bb79453acd6d7e3a58deeec4db3b5b27bf21e02fdcb60995
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 ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. A heuristic identified an external URI and a redirector link, specifically `https://mezovuduw.ru/123?utm_term=collapsing+toolbar+in+fragment+android`, which is indicative of a phishing lure for a free download. No scripts were extracted, but the overall structure and URL suggest a phishing attempt.

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
  • 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://mezovuduw.ru/123?utm_term=collapsing+toolbar+in+fragment+android PDF link annotation
    • https://cdn.sqhk.co/bezupidokaz/CIarYjd/hero_xtreme_200r_bike_photos.pdfIn PDF document text
    • https://cdn.sqhk.co/momogajopi/9dgfdtx/38782915805.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/ejbgiqX/78970639376.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/3Yhhidj/duzejewugogiri.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/exhfKNn/fury_roads_survivor.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/jbKwijQ/absolute_rc_heli_simulator_full.pdfIn PDF document text
    • https://cdn.sqhk.co/fekepazerox/C0zEeji/advertising_strategy_meaning_and_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/sefedetorup/ojc1QK0/91937196796.pdfIn PDF document text
    • https://cdn.sqhk.co/lawipavoso/Gih5geS/zegufujenugelejejen.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/jajcjfv/litedupu.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/gtbFgg3/80408860762.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/gdvQifW/new_york_fashion_dress_up_games_online.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/48dd6357-a2e6-4c53-a0c3-34d3341cc756/19994419966.pdfIn PDF document text
    • http://pukafenofi.epizy.com/microscale_synthesis_of_aspirin_lab_report.pdfIn PDF document text
    • http://zigazus.rf.gd/reglas_bsicas_palabras_agudas_llanas_esdrjulas_sobresdrjulas.pdfIn PDF document text
    • http://daxepusiz.rf.gd/westlife_songs_full_album_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9b2923-582d-4bc6-9638-cf76e92d6b2a/verifone_ruby_2_commander.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19789b5f-1117-40f6-875b-51caf76ce8a5/mikovukipesedetut.pdfIn PDF document text
    • http://rokosarod.rf.gd/zexesizo.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_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 5404 bytes
SHA-256: 6c30f0027b54bf8e2080b813fe4e11e8f8f23aaefc6e3cfe879db59ed5ab9811
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 11388 bytes
SHA-256: 38bbcab59c8943a91d15e116eca82b919cc852cd86f7a42306049462e0a4cafb

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