Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5d3726348c38ae…

MALICIOUS

PDF

70.0 KB Created: 2021-03-10 07:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8639a9298124e4bec77b4e42b9dc977f SHA-1: 61c03da4253a51d0159dc0d98eaa8dd1e79517e0 SHA-256: 5b5d3726348c38aece2ed1aa1927f07bf92374f0820e9c48020d6621079b8fd8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy on disposable hosting, commonly used for phishing or malware distribution.

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://druttle.ru/award?keyword=the+economist+magazine+september+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384472/normal_602150e641310.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/python_programming_language_book_freerzqvw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_5fdc6b70a2068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_602b891b52647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6044f87712e09.pdfIn PDF document text
    • http://kihepc.xyz/18953307142okukb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_603e4220d8b3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_602000dc0f27b.pdfIn PDF document text
    • http://steelsho3.club/the_professional_chef_10th_edition_p2x9fg.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/duties_of_a_housemani93yn.pdfIn PDF document text
    • http://euromarket.pro/12814585753eij9n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_841939ad06964963816499dbf7d24995.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_368a405b178f4e1bad6d275098674487.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db205c9-3095-49fb-934d-30f4a916bd96/roland_spd-30_octapad_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9cf5d7-59c9-4906-be7b-1aa90d93de05/50092282302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527fa02c-31ea-4967-a745-45ddde622145/horton_hears_a_who_characters_names.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_fd38cdac553746ac87ce5c70f6af2b37.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_360e5516f02b497caf58449eecb9281f.pdf?index=trueIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_94dca768ded5452fb4d5578971b16b9e.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_bd8239e49a5c4076b81d74b830642177.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2bf21f-2525-4061-8c75-e09276db743e/music_appreciation_final_exam_listening.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_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 5952 bytes
SHA-256: 3696a75669c702a628a4c312bece346e0dfa37fae05daf672f7edfd87e763dfa
font_01_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 10148 bytes
SHA-256: 249f95f73fcb3cbc1ccf3a736f850e9ad0f96943774dee5014832615124da2b2

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