Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa8bab5526552fa…

MALICIOUS

PDF

80.2 KB Created: 2021-03-08 11:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ee48367bb27387248e418751352d763d SHA-1: 11aa7a32238230c8e36a561ae003d10e52462871 SHA-256: 5aa8bab5526552faf7ad0a49f11fd4e47560f6b737baf4dc93fcd104cee6960f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of numerous external URIs strongly suggests the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/wix?keyword=unit+elastic+demand+elasticity+equals+1 PDF link annotation
    • http://libonox.22web.org/hd_wallpaper_for_android_abstract_art.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459482/normal_60376478704ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5ff7bcac99752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_60209b20d7611.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/ibgdgeX/54480047952.pdfIn PDF document text
    • http://limelusefi.iblogger.org/power_book_2_ghost_episode_8_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_60116225c464c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5ff7d07c5f5e6.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/gigfPif/wijoxivewofifinorowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_6029933a56d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_603cfbfc3342d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_601a8127747cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limulusukad.rf.gd/abhiman_odia_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/excellent_meme_gif.pdfIn PDF document text
    • http://zerujafulo.rf.gd/karuppusamy_kuthagaitharar_tamil_movie.pdfIn PDF document text
    • http://gomiguru.epizy.com/app_store_android_icon.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/66277890359.pdfIn PDF document text
    • http://tisevor.rf.gd/jazolopipobibozik.pdfIn PDF document text
    • http://roroturazukixij.epizy.com/4873041847.pdfIn PDF document text
    • http://poteluvomak.rf.gd/ashwini_nakshatra_serial_title_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/47612040612.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/product_rule_chain_rule_worksheet.pdfIn PDF document text
    • http://dovanokeji.epizy.com/74710186662.pdfIn PDF document text
    • http://gasigigi.rf.gd/comment_apprendre_le_vocabulaire_francais.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_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 5260 bytes
SHA-256: 1d2ba072270bf2b098ca77f0c5ed84a843a91e69cd41f1c10e0e91ad9355b549
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 10740 bytes
SHA-256: 96afb903d5183fe58d3ad4c920a61b0aed50ef235c47daca713662cd5f555d93

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