Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c361d0ea4e9fb9e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 17:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 19a9fec7d061eec46b82fa8f843efd60 SHA-1: 872a50cef79eaa274e68f9f0c7c063928beb3eec SHA-256: 2c361d0ea4e9fb9e0247e7de666a86cd246ebc87c84ffd4361f99495854ab32b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

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://druttle.ru/strik?utm_term=choose+your+own+adventure+map+maker PDF link annotation
    • http://ukrdomonis.xyz/suviraviluq9st0.pdfIn PDF document text
    • http://help-igcopyright.xyz/75685785906dqfhj.pdfIn PDF document text
    • http://theharaka.online/accellion_secure_file_transfer_user_guide7hk3w.pdfIn PDF document text
    • http://fulokixowo.scienceontheweb.net/bailar_bailar_line_dance.pdfIn PDF document text
    • http://zoompol.xyz/54152517150l4skt.pdfIn PDF document text
    • http://redirunna.xyz/oster_roaster_oven_recipes_turkey_breast1toa3.pdfIn PDF document text
    • http://mjawebdesign.net/increase_audio_buffer_size_windows_10tzivm.pdfIn PDF document text
    • http://copyright-supporthelp.com/example_of_informal_words_in_englishhnzjf.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/jiroraze.pdfIn PDF document text
    • http://xtreme-sport.ru/char-broil_big_easy_cooking_time_per_poundv9l0c.pdfIn PDF document text
    • http://basepati.22web.org/sufetumasaninukagovokatu.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/6998991425766ucf.pdfIn PDF document text
    • http://vinnipoh.space/acer_aspire_e5-571_e5-531_specs8u7vy.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/zamemigojat/67690410551.pdfIn PDF document text
    • http://bezepegu.epizy.com/vsco_full_filters_free.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/nokevi.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/zodevugiwalirijet.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/how_to_type_alpha_symbol_using_keyboard.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_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 5392 bytes
SHA-256: e99ad6219c6cce3e87b7b129bb93e9b8c74cf9771c11f78b68636b890a0d7d68
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10752 bytes
SHA-256: a8d65d38eb05c90bf73c9ea12550149f81000ad603f3d7bdd4d19f41750ba304

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