Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b11b68348d12008…

MALICIOUS

PDF

73.5 KB Created: 2021-02-11 23:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5ec32a3abcc07b36edc243cb57de89ca SHA-1: 772264d7b356fb8e232257b09a8b66b304fe11ae SHA-256: 8b11b68348d120082574354be43d4a8b46de6117ccb5337b4e4467a14b7c3543
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, potentially for further exploitation.

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://leonvi.ru/123?utm_term=etre+and+avoir PDF link annotation
    • http://jnatural.space/go_kart_planos_y_medidas4xenw.pdfIn PDF document text
    • http://lngcliente.com/mamas_guide_recipe_chickenwlpvg.pdfIn PDF document text
    • http://savadaqwe.space/92307074294t0z6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5fdc5609a125e.pdfIn PDF document text
    • http://businessmentality.com/carrie_a_estranha_filme_completo_dubladowp32l.pdfIn PDF document text
    • http://trokot-online.xyz/katululavufaw242az.pdfIn PDF document text
    • http://marketeuro.pro/wojedidaf8trdc.pdfIn PDF document text
    • http://leaninrzpd.site/razalean_reviews_2020yyz4u.pdfIn PDF document text
    • http://ru-payment.casa/centerville_city_schools_state_report_card0gu8c.pdfIn PDF document text
    • http://ekzo-fruit.ru/summertime_saga_latest_version_android_apk2cx8b.pdfIn PDF document text
    • http://chestlune.online/velodrome_track_material6k8mj.pdfIn PDF document text
    • http://car-test.pro/13878471075w60bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/carhartt_size_guide_womens_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/26351075201.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/76644665611.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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 4628 bytes
SHA-256: d84f1dd6705d78ccf43b284ad8fa33aa7c2684895259a30828a29b31e33a0103
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 12104 bytes
SHA-256: 56fea3e7d4c6a18514199dba993c341a1242df0a7d922ce8150a6a90f17d16bb

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