Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8e5cf08d6de67c…

MALICIOUS

PDF

72.0 KB Created: 2021-01-18 04:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bfecc66936d9bbc2ab0fca235b63db01 SHA-1: 365d8e895655dcf9d7fc51a4c0c4992c4ef4f763 SHA-256: 1c8e5cf08d6de67cf04ca45314c3daf6bb7b609ce066e14510f432e6ce243605
126 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=e+melodic+minor+scale+viola PDF link annotation
    • http://sunepoxuvigos.66ghz.com/apresentao_powerpoint_tecnologia_da_informao.pdfIn PDF document text
    • https://site-1228341.mozfiles.com/files/1228341/zutimorurazufemofi.pdfIn PDF document text
    • https://site-1254585.mozfiles.com/files/1254585/75165559337.pdfIn PDF document text
    • https://site-1172728.mozfiles.com/files/1172728/chain_reaction_versace_watch.pdfIn PDF document text
    • https://site-1235942.mozfiles.com/files/1235942/29246447484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mokimonanogi.rf.gd/speak_now_world_tour_live_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/69218630178.pdfIn PDF document text
    • http://guruwemuzotal.epizy.com/active_directory_connector_oim.pdfIn PDF document text
    • http://fejusadifidexi.epizy.com/whatsapp_for_android_phones_free.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/extra_value_meal_price.pdfIn PDF document text
    • http://bugelinuxobeva.epizy.com/najasilamule.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/warlock_dota_2_guide_reddit.pdfIn PDF document text
    • http://pagosunizuboroz.epizy.com/chess_tactics_books.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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 5104 bytes
SHA-256: 993aafba57deba307558592180f2a30e720c528d1980fc1984902c2cecc95078
font_01_sfnt_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 12092 bytes
SHA-256: b59287da6b6ea1a2a5fb64e96e3ea392f74aeb6d025844573e235fec413df774

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