Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c0b905110d322f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 13:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15fbd931f684be528f6dc0663fedacee SHA-1: 23bbaf437207d1351280e1149314aa5dd564dab4 SHA-256: e6c0b905110d322f273c432714150e511052dd6b3e4d48b7aed552e1a74e3c31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs and a link farm heuristic suggests an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall evidence points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bkmarine.net/ckfinder/userfiles/files/1630584417.pdf In PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/29432116034.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/74997862074.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/futag.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/34313915996.pdfIn PDF document text
    • https://basisangka.com/contents/files/zubixojowezigimuguxenaxa.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/tapejir.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/98449020820.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/vexanekeje.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tavozafuzevunoge.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/44162959022.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/27126048697.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c2ab7b08b9a020c63110ec51904db529/16772853106.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/92347126811.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/xaxubunukas.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/61296214860.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/32861724509.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mulitat.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/mubukul.pdfIn PDF document text
    • http://becucci.it/userfiles/files/buvasewazaxub.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/88577378856.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/umruic1kohr89cl01n9d570js1/mexabamevibonogerobawaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+activate+office+2019PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 17292 bytes
SHA-256: f0b7d52c20e17e753495b95c7159b139f18ce322a7168fc23e9be6fdf47678a1
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 10816 bytes
SHA-256: 378315574087a6e7d1603e1d7cd83ca8f5c9d78047980c409afd90bce8abb855

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