Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb54df72e9c3d46…

MALICIOUS

PDF

80.8 KB Created: 2021-02-28 13:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 08ebf495dd51a3e88d185d62e3e57d33 SHA-1: c8a9b5211f4a292fa10e6e260d11333c850d5e3d SHA-256: 3eb54df72e9c3d467969d4addecc82ba3215b566b7b8f3dd10b50704d1db8d32
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing. Although no scripts were extracted, the presence of external URIs and the nature of the PDF heuristics point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://resalured.ru/strik?utm_term=is+about+capitalized+in+a+title+chicago+manual+of+style PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496170/normal_5ff69b67bc1a8.pdfIn PDF document text
    • http://scm03.ru/ielts_academic_vocabulary2uhey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_6022c5900d589.pdfIn PDF document text
    • http://kawlites.online/92962248345uma7l.pdfIn PDF document text
    • http://bitcoins-profits.com/82319632237ozurr.pdfIn PDF document text
    • http://sfhgfje5df.xyz/buwufukosonabusabixumrk4q.pdfIn PDF document text
    • http://edevletorg.com/lofamimukepefukiziwrfom.pdfIn PDF document text
    • http://tudewulowas.iblogger.org/71143297950.pdfIn PDF document text
    • http://maselawave.22web.org/boat_us_app_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5ff03f909eb25.pdfIn PDF document text
    • http://zugawumaz.22web.org/salary_certificate_letter_format_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411926/normal_5ff062a8ebfdb.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/macmillan_gateway_b1_teachers_bookqyh43.pdfIn PDF document text
    • http://letgtma.bid/delevuxivineruxobegunikakuf9eq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380863/normal_5fdfbb9458889.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limedebenilaz.rf.gd/anti_formiche_da_esterno.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/converter_em_word_candy.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/game_adventure_mod_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/tencent_pubg_emulator_for_mac.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
    • 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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 5700 bytes
SHA-256: 477c28d96b92dbd7f24469b968ce20213824308d6dc435eb4dfce819239e6107
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 10428 bytes
SHA-256: eb38a7a5832d096700380be5942ee2b3c5d5da32ad87b86696ede2c00e6a512c
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16336 bytes
SHA-256: 92ca5277a07040a1118e6ffe557fff1b4332eaf15e577e4df2dfa25513d903e2

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