Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f36e5ff6fb6618…

MALICIOUS

PDF

76.4 KB Created: 2021-03-22 01:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92f2383d1976f80bb3fab77f1d077689 SHA-1: d1274c991800e4c834154ab9aa2acfa25126dae7 SHA-256: d4f36e5ff6fb661871ed75758ba40abaedf329093190612ab5093ef6310f8875
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/award?keyword=center+parcs+longleat+activities+pdf
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/2a958cb.pdf
    • http://relibafogat.sportsontheweb.net/love_me_if_you_dare_movie_watch_online_free.pdf
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/655234.pdf
    • https://lutaxabivuk.weebly.com/uploads/1/3/0/7/130740512/wuxoda.pdf
    • http://tuderoba.getenjoyment.net/criterios_cetoacidosis_diabetica_pediatria.pdf
    • http://sagedix.medianewsonline.com/12395894266.pdf
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/0f36b2.pdf
    • http://koziwebakeru.iblogger.org/xovodomafifijipan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vibuvomomuv/10054315479.pdf
    • https://s3.amazonaws.com/tonisefoteka/alternaria_fungi.pdf
    • https://s3.amazonaws.com/zufojadibi/22137406207.pdf
    • https://s3.amazonaws.com/megujobemegor/63700162621.pdf
    • https://uploads.strikinglycdn.com/files/ea246870-29fc-4675-81b1-67e7ee91639c/galaruturupudapofubuka.pdf
    • https://uploads.strikinglycdn.com/files/372c6128-00e3-4d73-b4c3-f115debc6cc5/nunud.pdf
    • http://kitilogokufalu.atwebpages.com/55419829046.pdf
    • http://zisunajupanege.rf.gd/xavuzuvaserudinurasep.pdf
    • http://pusupap.rf.gd/break_dance_tutorial_free.pdf
    • https://s3.amazonaws.com/gasodamuza/kamuxidolujedidot.pdf
    • http://kigitom.epizy.com/printable_world_time_zone_map.pdf
    • https://s3.amazonaws.com/babetafaperaxov/celina_sharma_songs.pdf
    • http://memepev.myartsonline.com/14757646833.pdf
    • https://s3.amazonaws.com/kavifunaruvi/gujisazawitir.pdf
    • https://uploads.strikinglycdn.com/files/b8831c3e-7eab-45c9-9b70-b5af398f2841/what_is_screening_in_psychology.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_off0000f0b1.bin
2e8b4b66361aefa480c393686fd0c803de17a304b4352b8d830c5c34928ed710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 5288 bytes
font_01_sfnt_off000102bf.bin
6a921522a94d0d6643bfe72710d8f1718ec95917a8b2b5d9da42606084cef24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 9776 bytes

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