Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d7a03d479655c9…

MALICIOUS

PDF

80.3 KB Created: 2021-03-24 19:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: feb7799a73389d2e07c590655c3d3ee7 SHA-1: 2117f50c9144ba69f9e0dee4219a7ceaadad7200 SHA-256: 51d7a03d479655c9d06fbd9e006ba89e3ff92173faad6cce8e0291f586d7ff0b
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the document body, though partially corrupted, indicate an attempt to lure users to external sites, potentially for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/strik?utm_term=shark+1600+watt+iron+reviews PDF link annotation
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/kenubeferer.pdfIn PDF document text
    • http://storeplus.pro/tomufon870w.pdfIn PDF document text
    • http://bazazodagipaju.22web.org/xujenir.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/agiiijd/switzerland_age_pyramid.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/vekidunodidofoweteno.pdfIn PDF document text
    • http://clebohets.xyz/best_turkey_choke_for_stoeger_m3500i7g3w.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/Fvjh5jd/school_of_dragons_cheat_codes_2019.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/mevamupodal.pdfIn PDF document text
    • http://testrun.ru/rutawozulugivazugisiwogz2gz.pdfIn PDF document text
    • http://sirofopunisatus.iblogger.org/icloud_lock_removal_tool_free.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/kulatojoxevepup_vidusopaxuma_tawisakufekadap_napirawazir.pdfIn PDF document text
    • http://mifvideo.space/vudebalupotimadavepebf8j6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_c5f5358d9f104cc8863fcdf0d11ceaac.pdf?index=trueIn PDF document text
    • http://semewefiji.rf.gd/47499061774.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/11483137699.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_efbedbc309be4ea9a43dfe7d585f0db2.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_3e50c0d2153d463aa1cd1a9f189d6bba.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_af446679987c48b5a142287f7c84c2a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/pdf_to_word_converter_nitro_online_free.pdfIn PDF document text
    • http://mikusadetov.rf.gd/44535693036.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/kokawuletopunen.pdfIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_b523e6cfd053433ba6056ea2b839d4ae.pdf?index=trueIn 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_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 5408 bytes
SHA-256: 59af0e27bece4603faa0c55623ddc2c310bbc2b1733197ca31db591c3e7b1861
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 10824 bytes
SHA-256: 5abbbc23d92ce525bf44279309bb2775824b4ccb4a8882501b7524d8b2654c2e