Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6c806126e8756b…

MALICIOUS

PDF

74.0 KB Created: 2021-02-18 02:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3b3ae0dd2b4d009c73b6688bfb09b817 SHA-1: bba15f975140eb84788a6827a652e5d9d64438ba SHA-256: bd6c806126e8756b96b46e5bef114b8d17c186f429fd6244b4aefb2423749609
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for malicious purposes. The presence of external URIs suggests the document is designed to redirect users to potentially harmful websites.

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://seumenha.ru/wix?keyword=area+and+perimeter+word+problems+worksheets PDF link annotation
    • http://watewuwij.22web.org/charismatic_leadership.pdfIn PDF document text
    • http://promooffer.site/755988619508q0d6.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/chfN2x7/glitter_lips_with_makeup_brush_set_coloring_games.pdfIn PDF document text
    • http://fortuneo.biz/latest_bootcamp_windows_10_drivers0vzua.pdfIn PDF document text
    • http://trysalon.xyz/dunaluwulejidokesiwqvi8.pdfIn PDF document text
    • https://bobixazila.weebly.com/uploads/1/3/4/5/134599816/35dad7a8fade63e.pdfIn PDF document text
    • http://texukajiz.iblogger.org/59983345393.pdfIn PDF document text
    • http://tujomof.22web.org/gutisaxu.pdfIn PDF document text
    • http://manoligixave.66ghz.com/27868072675.pdfIn PDF document text
    • http://worldhold.online/gevubexideripakuvmxmz0.pdfIn PDF document text
    • http://verenica.net/cash_app_phone_number_customer_support1b0ik.pdfIn PDF document text
    • http://fokuguxeni.iblogger.org/5417818259.pdfIn PDF document text
    • http://idealica-official-it.website/kuzenugiruluvedomiw49nzq.pdfIn PDF document text
    • http://fitnesspack.net/22414886818h01u6.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/wujukerivez.pdfIn PDF document text
    • http://metalllift.ru/xomepegegirakekgg8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesunofopum.epizy.com/rachmaninoff_vespers.pdfIn PDF document text
    • http://manutilo.epizy.com/cambridge_vocabulary_for_ielts_advanced_with_answers.pdfIn PDF document text
    • http://gomupinoteripa.epizy.com/math_worksheets_grade_2_to_print.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 5484 bytes
SHA-256: 6f9a5700f532e61128fabdefc720a810d439894a359c59b058d54ea897040bcb
font_01_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 10860 bytes
SHA-256: 2e88099025cffd9141506967186f0adbbf335e8511fdd0449347d6a71f104f71
font_02_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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