Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ef35687961f3c8…

MALICIOUS

PDF

75.1 KB Created: 2021-02-27 07:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c2954216fb5292b819b80277c4c41de5 SHA-1: 83caafc93d49fd7efd800011dc6b01cd66ac6f05 SHA-256: d7ef35687961f3c8dba6bb0db68ecf61c33dfa9025ec4c82910823b4c6a01a57
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the attack pattern of tricking users into downloading further malicious content. No scripts were extracted, but the PDF structure and external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=what+are+the+benefits+of+using+ipads+in+schools PDF link annotation
    • http://zuzorovix.scienceontheweb.net/mabobefazorunakavar.pdfIn PDF document text
    • http://ontrade.top/cuantos_centimetros_tiene_un_decimetro_cubicoxfxfo.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/club_cart_parts.pdfIn PDF document text
    • http://gramnews.xyz/94656190677r3z78.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/kendo_grid_group_row_template.pdfIn PDF document text
    • http://zespodsvetkoy.site/lux_aeterna_sheet_music_choir44f10.pdfIn PDF document text
    • http://sallles.ru/ableton_software_free_full_versionqph8f.pdfIn PDF document text
    • http://biribekagupelu.66ghz.com/33295974086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risawanidav.epizy.com/navra_bayko_marathi_movie.pdfIn PDF document text
    • http://kopolug.myartsonline.com/bafezujofupopexazaf.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/atividade_epileptiforme_multifocal.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/easy_keto_meals.pdfIn PDF document text
    • http://towawemigegi.epizy.com/gumekopajinotunax.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 5568 bytes
SHA-256: 395f789a3076182caf870d2056fa65b68f58dec865656ad9d4e7209b75954a1e
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 11040 bytes
SHA-256: cc722ec4d98d5807aa4ebfe98ae457afc0a567e1ebd2f460766809d282f8a13d

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