Malicious PDF — malware analysis report

Static analysis result for SHA-256 a428d1327ac8f1d8…

MALICIOUS

PDF

77.8 KB Created: 2021-05-13 15:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c137e709782a28a51820275e5ab29de SHA-1: 15bcd623857b9da96e262e520500fce7f1e7a0a7 SHA-256: a428d1327ac8f1d8fdb36b8c2587c59b6ed879b4f8b431cabc86388db4b626d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=netgear+wgr614v9+tomato+firmware
    • http://fullhp.info/how_much_do_army_jag_officers_makebcgwc.pdf
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/bezopumovo_wuwiw_duzor_lobuwa.pdf
    • https://static.s123-cdn-static.com/uploads/4402722/normal_5feb6c9636f61.pdf
    • http://pitushok.space/teddy_bears_picnic_piano_chordsasel6.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_604661bf2e32f.pdf
    • http://newsportstechnology.ru/how_to_reset_password_on_panasonic_cordless_phonehyxuf.pdf
    • http://vkysnaya-eda.site/betonefajuxow5ekd.pdf
    • https://static.s123-cdn-static.com/uploads/4475016/normal_6004d943828c2.pdf
    • http://s7hmus.org/wokafawedi9hqov.pdf
    • https://xodefoxewez.weebly.com/uploads/1/3/5/3/135325776/1290656.pdf
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/dawidase-buzavol-dimalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_d9e45b27192d41f7b6f9f01935952062.pdf?index=true
    • https://s3.amazonaws.com/bezutu/kexirimakaribiwopejozu.pdf
    • http://sakikuzugodo.rf.gd/garmin_vivofit_jr_1_waterproof.pdf
    • https://s3.amazonaws.com/xopugup/jofafurexuzap.pdf
    • https://s3.amazonaws.com/bepukuba/chemistry_a_molecular_approach_solutions_manual.pdf
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_280b0407b81c4d6da31c443e6ed2e2de.pdf?index=true
    • http://wosezime.epizy.com/18254649451.pdf
    • https://s3.amazonaws.com/lemefofutomapox/42605518453.pdf
    • https://s3.amazonaws.com/wulotugadag/antivirus_apps_for_android_free.pdf
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_2e3809aa437c4fa4b8188cf9e8150899.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_off0000e3b9.bin
92dc1351bfe84e50615edae4946baf635898c7a49aac3b449b14a83e42e9f2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 5132 bytes
font_01_sfnt_off0000f557.bin
239be04c1e8a0dbd87fd3178f927e4b83fc10161b6189d7a57e196841d335bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 11244 bytes
font_02_sfnt_off00011bbf.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 4324 bytes

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