Malicious PDF — malware analysis report

Static analysis result for SHA-256 381d3cbf6dfed56c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-01 00:17:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7e0e3716a99e9e65d9fb3be2782a3243 SHA-1: fcc0ee68100dd2e06b6ff22aaf8e01214314dc17 SHA-256: 381d3cbf6dfed56c24dd5e80d6eb4e1be602915c6d5bd0b34862532373451926
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=flowers+in+the+attic+trailer+2020 PDF link annotation
    • http://aicberg.net/what_does_pre_production_mean_in_filmvgr9a.pdfIn PDF document text
    • https://bekefipupo.weebly.com/uploads/1/3/4/0/134096026/fulokudosifid_luwikagow_xikabakepavike_ritamitefadiw.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/50976258057.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/dEgf1iq/lelokolajuruduvuxoj.pdfIn PDF document text
    • http://new-leggins.site/how_to_make_rope_halters_with_four_noseband_knots0udbk.pdfIn PDF document text
    • https://xotubowewetiner.weebly.com/uploads/1/3/2/6/132696149/94e7477.pdfIn PDF document text
    • http://byt-upak.ru/67919787683qy0c6.pdfIn PDF document text
    • http://medyayazilimtr.com/47376569725gmiea.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/erkibKF/smash_champ_mod_apk_free_download.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/xosew.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/5934281.pdfIn PDF document text
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/2011036.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/67481718009.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/tudolirovopudogora.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/3wAhetW/debajokowigufirutelus.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/icLXjhj/3d_home_interior_design_software_free_full_version.pdfIn PDF document text
    • http://radulukolataleb.iblogger.org/hornady_reloading_bench_stool.pdfIn PDF document text
    • http://robinmani.site/42241542368m5zw4.pdfIn PDF document text
    • http://new-volosi.ru/ipcc_sixth_assessment_report_ar658ysq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 5208 bytes
SHA-256: 338cf5b2bfe4a0672aadc7aef1de9facb8057affd13f1efdcb4cf0463aebbd05
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 10264 bytes
SHA-256: 7f76ad0f85f3ecfb84e5e3d0ec9c38aeeb5be00698426afa7a4465acf946df82

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