Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e81c47c7b28cfe…

MALICIOUS

PDF

74.3 KB Created: 2021-04-23 08:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1da589ba0293a9bb007bf37b7d532489 SHA-1: 727ee873a39fa88e27386b5ede5d1d6ba7d2e767 SHA-256: 51e81c47c7b28cfef46d1af03952316ec907c615a7fb3b2e29e71b6fa69a172a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/strik?utm_term=does+international+first+class+mail+have+tracking PDF link annotation
    • https://cdn.sqhk.co/sotisajen/fgcjuhg/159863307.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/ghdPuiP/20367142545.pdfIn PDF document text
    • https://cdn.sqhk.co/kowetitemaro/af6Yd7U/srs_prestige_west_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/njjhcgi/slots_online_free_no_download.pdfIn PDF document text
    • https://xazowivuxef.weebly.com/uploads/1/3/4/5/134513065/wibavobuwir.pdfIn PDF document text
    • https://befawiboper.weebly.com/uploads/1/3/5/3/135389238/mazigefenogegafir.pdfIn PDF document text
    • https://xadebunurag.weebly.com/uploads/1/3/1/4/131454816/4742477.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/ijjjVgJ/formula_fast_races_free.pdfIn PDF document text
    • https://cdn.sqhk.co/funixatugesi/bOghVha/36556539600.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/jbCeSig/numifov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f033df7-eb47-4352-a78c-a5b70b8db8d6/what_weight_is_bernat_super_value_yarn.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/1997_ford_f350_service_truck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aefa0d9-c665-42dd-aff0-322a3ff34be0/roxamineripavibazirari.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/how_to_reset_a_samsung_smart_tv_to_factory_settings.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_d0586649d0c447d68496dadb9ec7a3e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/620a82cb-ec84-4552-8c55-27a12d7d8573/how_to_replace_belt_on_dyson_vacuum_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/62749997171.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_08d40d4411b542b3a03710f7fa7a42dd.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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 5416 bytes
SHA-256: 915e81d579293284d4808f37536e809929683f739796d09545669f43e49788dc
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 11568 bytes
SHA-256: 96c578ab701482df16d004f6feaa908b85b500a0f83bb0e1bffc128b64e9b4c4

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