Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ed425e8d574cc8…

MALICIOUS

PDF

69.3 KB Created: 2021-03-16 23:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e5438b5b1214bba745bcb71b118754df SHA-1: d2edd6be419246b13852ebc1f38949fc49e3d5d0 SHA-256: 66ed425e8d574cc83631854ce3f8afbe05262d096f9c1db6852f9f8f494c0806
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and exhibiting characteristics of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://baarspo.ru/123?utm_term=character+development+graphic+organizer+pdf PDF link annotation
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/zofuriwaxaxode.pdfIn PDF document text
    • http://opssmall.space/nuxiwenijadasepewimobum8btb6.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/jdjcbrQ/xeraxanigubowup.pdfIn PDF document text
    • http://tiktokfrance.fun/229497909744o42v.pdfIn PDF document text
    • http://site-shop.xyz/best_light_novels_to_read_wuxiayivyo.pdfIn PDF document text
    • http://dkmz3.club/process_flow_chart_template_xls_freeyp4kf.pdfIn PDF document text
    • https://cdn.sqhk.co/mivivezar/jhVgcii/lozufise.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/43226274263.pdfIn PDF document text
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/liluzukape_padakagupuz_konozusanulidom.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/9459609.pdfIn PDF document text
    • http://bitjoms.xyz/kezodijeramuwewstzks.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/HjcDgc3/37051860438.pdfIn PDF document text
    • http://fbdirect.site/38208402930w8oix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/all_mathematical_symbols_name.pdfIn PDF document text
    • http://pilejifizodan.onlinewebshop.net/twinkle_twinkle_little_star_violin_notes.pdfIn PDF document text
    • http://gomokirov.rf.gd/cuanto_equivale_2_metros_en_pulgadas.pdfIn PDF document text
    • http://waxozex.epizy.com/gulivudiwimavu.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/what_is_the_name_of_the_gatekeeper_of_hell.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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 5404 bytes
SHA-256: 14471459e498e67f30faaa6016b5e917b91ea4ea73614f80bd7638e5d9b97934
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10352 bytes
SHA-256: 63e866068ffa71b9933d2623c4563fc374a59215cb43a9e287d496458ebd1238

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