Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b487335a6c412ce…

MALICIOUS

PDF

81.0 KB Created: 2021-03-24 17:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 041481e01dae187361a72b28614c56d5 SHA-1: f781521bfffff197c985350399cfc921165f077e SHA-256: 5b487335a6c412ce149b57665d00fa9daf7280d180a4c165f8eb7ef406fa4e2d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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/123?utm_term=information+about+mpsc+and+upsc PDF link annotation
    • https://cdn.sqhk.co/fazovivum/hhWjbgf/9274721838.pdfIn PDF document text
    • https://jaduvobawitirok.weebly.com/uploads/1/3/4/3/134398576/salup.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/khiMihz/how_to_make_fluffy_slime_uk_ingredients.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/28910f5718.pdfIn PDF document text
    • http://zupezejukiselu.22web.org/cfd_software_tutorial.pdfIn PDF document text
    • http://gudituxubimof.22web.org/powiwekifujimimabumule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_6053af20907e1.pdfIn PDF document text
    • http://gegetamuwu.iblogger.org/how_to_use_a_keurig_k10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5ff007634a1f4.pdfIn PDF document text
    • http://sanezukevuzav.iblogger.org/givuduvotatixula.pdfIn PDF document text
    • http://smotrikino.fun/pobitakeganiliguse2jgc6.pdfIn PDF document text
    • https://tatuxosigataban.weebly.com/uploads/1/3/4/7/134770737/2939035.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/jbP4jah/guzizisaxeriwizalak.pdfIn PDF document text
    • http://baltika-trans.ru/menafepavy05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6029d382d7c2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5ff1d4f0df6f8.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/7932259.pdfIn PDF document text
    • http://bossyonlinex.com/cellular_biophysics_transportf3e4m.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/emMRQcy/sim_dashboard_ps4_dirt_rally_2._0.pdfIn PDF document text
    • http://bufo.online/59936675499ks82r.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/dhc9hjc/24519827838.pdfIn PDF document text
    • https://cdn.sqhk.co/dowepigakaw/ziaEohd/ninja_shake_machine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 5344 bytes
SHA-256: f2a21aac66c716146c33358040b2d61440ba1e6cae0b47d0208fe61676ca72eb
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 10940 bytes
SHA-256: d48e333199cc463145ccd61472a25086774b37f48c1a8b6c154e17f394bae753
font_02_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 4052 bytes
SHA-256: 94a4482dacb58f1cb446f4fe45cc236c1e878c0e3ee40e9a316a11734a71984a

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