Malicious PDF — malware analysis report

Static analysis result for SHA-256 4487a8ff536b330e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-14 02:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0ad5aa0a5df9e6414d07bc0612c481da SHA-1: a3bfabfff677a714d4d5d65b0394a1c1659bf07f SHA-256: 4487a8ff536b330e5b3695c8bbbbb93ff34b2275a2092a2437c46ff2b7081d69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://nipisod.ru/award?keyword=callan+method+pdf+stage+5 PDF link annotation
    • https://cdn.sqhk.co/pazakazagoz/fjbmRje/jozuwup.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/9172121.pdfIn PDF document text
    • http://vamidotaxipigop.iblogger.org/international_dt466_dt570_ht570_service_manual.pdf.pdfIn PDF document text
    • http://sexesex.site/zedelatevizogonesekoxkjryk.pdfIn PDF document text
    • http://usechambre.xyz/74577172181qmlm7.pdfIn PDF document text
    • https://xotubowewetiner.weebly.com/uploads/1/3/2/6/132696149/89fb24a2298abd.pdfIn PDF document text
    • http://bolozofer.22web.org/selikufokanetom.pdfIn PDF document text
    • http://senteber.site/94241219753cf8d6.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/lLhaIii/stickman_destruction_3_heroes_mod_apk_android_1.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/fd4592.pdfIn PDF document text
    • http://fragcups.com/ludiwolupivikevudatu3p81b.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/iUjc7bF/rudevidololo.pdfIn PDF document text
    • http://tesocoin.online/setapuzofofogusupuwxsqp7.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/ygcMGgi/agenda_meeting_format.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/gadenegejofigafusuf.pdfIn PDF document text
    • http://floradoma.net/xugijisopadivobedoa2p9w.pdfIn PDF document text
    • https://cdn.sqhk.co/nonebizi/hjfifhi/african_american_hair_braiding_salons_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raxajuneneg.epizy.com/how_many_calories_in_a_vegan_taco.pdfIn PDF document text
    • http://fufagagebo.epizy.com/adjudicate_today_application_form.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_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 5388 bytes
SHA-256: 1125f64c8f91d2701e961cd9f9309fdad433086e7ca2f77feb1b8beb00a828a8
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 14244 bytes
SHA-256: 895b46184293811e40209f726cfb4859348a405b91afbca2b07b49f1f3ffbe52

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