Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1208312f669b90…

MALICIOUS

PDF

78.7 KB Created: 2021-03-14 22:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f484630dfaaed488c6968f3a5cbad1 SHA-1: 701c30616bfa0a468537bed1ab31412fc8d5974b SHA-256: 6e1208312f669b9034d3a8edbac802bbbd3cc9901971faa3e163d943a74b7bcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, indicating a link farm designed to redirect users. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://kuzutuzo.ru/wix?keyword=rwby+maya+models
    • http://msertis.xyz/how_hard_is_the_florida_real_estate_broker_exambfj4r.pdf
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5feb5092af1e5.pdf
    • http://sawemawe.mywebcommunity.org/81515583939.pdf
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fe9aa59782b6.pdf
    • https://static.s123-cdn-static.com/uploads/4472495/normal_600334915f1af.pdf
    • http://mekatososa.iblogger.org/school_id_card_making_software_free.pdf
    • http://rajajime.mypressonline.com/30235333370.pdf
    • http://fodefon.getenjoyment.net/uglys_electrical_reference_free_download.pdf
    • http://bcpzonasegur4viabcp.com/mamet6akou.pdf
    • https://cdn-cms.f-static.net/uploads/4481285/normal_5fda05a86b847.pdf
    • http://swiss-gear.shop/sharp_el_1801piii_calculator_ink_rollernmfpf.pdf
    • https://cdn-cms.f-static.net/uploads/4495854/normal_601005df8d63e.pdf
    • https://cdn-cms.f-static.net/uploads/4462980/normal_6026c1cd1ddd7.pdf
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5fe56f9067473.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_c6c09b512e214a0a8fb2309dd05c4243.pdf?index=true
    • http://buzanuziti.myartsonline.com/65495865809.pdf
    • http://xijuroluzuka.epizy.com/audio_bible_for_android.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_885cc9cee84447b6b93ff988fb51afb0.pdf?index=true
    • http://pomewegipezu.rf.gd/sutalazavisinel.pdf
    • http://telomilabevi.epizy.com/mazufokunodinuguruva.pdf
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_2eaa504114964df9b18c6ffa6a5504e3.pdf?index=true
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_153e02a78115437681a3f7f594bc5b5b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92d.bin
8b86e210e3a1bcb014304f5ce7e6823112242443a979fdd1ccb8f36e7e1e874b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 4768 bytes
font_01_sfnt_off0000f96e.bin
ed33f0aa2877d259228d62852b770f91727ba301b69f53f1752484d8e15b13d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 11392 bytes
font_02_sfnt_off00011fa1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 4324 bytes

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