Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ba3b5808324733…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 21:35:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ce29def2079f56f2542f413b9b5cabc3 SHA-1: 273bfd008c0aca6ddbd484e77388c5abb0768d6c SHA-256: 70ba3b5808324733f1185d8140db6b42f0d9612ad1f0c021e93c540fc71ec8d1
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 numerous embedded URLs, many of which point to disposable hosting or unknown reputation sites, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=badminton+score+sheet+pdf+download PDF link annotation
    • https://cdn.sqhk.co/silinetufid/ghahfjf/kadasobometaxod.pdfIn PDF document text
    • http://xudisoda.66ghz.com/delinquency_notice_template.pdfIn PDF document text
    • http://sehq.xyz/9551808990n3fs9.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/ijib7mW/23780601513.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/9hcc4jf/22225044588.pdfIn PDF document text
    • http://dressnbuy.com/self_laminating_sheets_cvspq04h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://didevuxuwodur.rf.gd/57309089499.pdfIn PDF document text
    • http://sizixezaratog.rf.gd/blue_cross_blue_shield_mn_claim_form.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/logoduve.pdfIn PDF document text
    • http://dilowopuvuzi.rf.gd/56091146228.pdfIn PDF document text
    • http://rezopaduj.epizy.com/what_is_the_normal_a1c_count.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/cv_template_word_free.pdfIn PDF document text
    • http://bibirosomuxir.epizy.com/glencoe_health_chapter_26_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/super_systems_oven.pdfIn PDF document text
    • http://relumewamamit.rf.gd/first_alert_smoke_and_carbon_monoxide_detector_test.pdfIn PDF document text
    • http://wuxegutazaxelox.epizy.com/19529779955.pdfIn PDF document text
    • http://rivebop.epizy.com/baxivewubenowuji.pdfIn PDF document text
    • http://momugegunimex.rf.gd/3844550307.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/6449206687.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_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 5536 bytes
SHA-256: 669572592ec579efe4023947a967394e0ae1c29167e27e4137ed3090c85d22bf
font_01_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 11000 bytes
SHA-256: 8b1d0650f27b9e11a662775f410ba149c0cc0c83a36af644d83e4dda41039e18

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