Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee0093f565ba521…

MALICIOUS

PDF

72.3 KB Created: 2021-03-12 08:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f91df686ed44428def2cf2295707298f SHA-1: ef57c06b5d4f04e7a396082d4ca4666d9b78eeb4 SHA-256: aee0093f565ba52188b000069576914899cb195e353222145db7b8dc79b3b3b1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic indicating a link farm designed to direct users to various PDF documents. The document body, though heavily obfuscated, suggests a lure related to calculus textbooks. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=calculus+and+differential+equations+book+pdf
    • http://labifovejes.mypressonline.com/creative_writing_prompts_for_4th_grade.pdf
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/9bd10558c6e1c5f.pdf
    • http://nageramuvepom.mywebcommunity.org/calculus_early_transcendentals_4th_edition_smith.pdf
    • http://rupazaduxil.mywebcommunity.org/75969515996.pdf
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/1dbce86508cfed.pdf
    • https://winokagadav.weebly.com/uploads/1/3/2/7/132740598/numaketir.pdf
    • http://zogometemo.sportsontheweb.net/how_to_build_a_bridge_out_of_spaghetti.pdf
    • http://zokoxakabu.medianewsonline.com/36513275012.pdf
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/283789.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gudukupir/65861071467.pdf
    • https://s3.amazonaws.com/fajeloninesitel/watch_war_and_peace_online_free_123movies.pdf
    • https://s3.amazonaws.com/webipejonavuv/1-_99_smithing_guide_osrs_profit.pdf
    • https://s3.amazonaws.com/wozowuledij/bourbon_reforms_in_central_america.pdf
    • http://diwavubodinaroj.myartsonline.com/kibirurebowafoxizobifal.pdf
    • https://s3.amazonaws.com/lorugipopuxe/rumedonufiwenutinixofibav.pdf
    • https://s3.amazonaws.com/luborinizu/learn_python_interactive_reddit.pdf
    • https://s3.amazonaws.com/bisazabe/13145292536.pdf
    • https://s3.amazonaws.com/vebisop/61451477143.pdf
    • https://s3.amazonaws.com/tigewibejageju/kezegewubidogedotubozit.pdf
    • https://s3.amazonaws.com/kukupunopedon/limomodizunasokamer.pdf
    • https://s3.amazonaws.com/jolozidabi/brandon_grotesque_free_font_mac.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde7.bin
060b4afd5960729885bbdcf8baa18c6a54db7760ffb054f2e800c3c8610e1cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 5384 bytes
font_01_sfnt_off0000f03a.bin
3e02b3b82625a57c2933eac44802d32978c7c765bcaf514b13cf902e1883306b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10368 bytes

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