Malicious PDF — malware analysis report

Static analysis result for SHA-256 05aac3e32d37852f…

MALICIOUS

PDF

82.6 KB Created: 2021-04-17 21:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9583350af96b6c85afa619a6f171e275 SHA-1: 7e6269448b465ecca21675c60f9a14646b51186f SHA-256: 05aac3e32d37852f1de41b907bb5d1242e8d5aaa603d106ea695a4562ae84a43
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains elements that could be part of a lure, and the presence of numerous links points towards a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=ap+music+theory+test+date+2021 In PDF document text
    • http://hermidkovo.info/wokoxukunibeyi0i0.pdfIn PDF document text
    • http://xazufajemexeb.22web.org/stock_valuation_report_format.pdfIn PDF document text
    • http://kinatoguvekajux.22web.org/avesta_free.pdfIn PDF document text
    • http://bestplacefor.rest/namaz_parhne_ka_tarika_in_urduqywqk.pdfIn PDF document text
    • http://fukipinegu.22web.org/memoxo.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/integration_area_under_curve_worksheet.pdfIn PDF document text
    • http://trylait.pro/5_senses_grounding_exercisei3skw.pdfIn PDF document text
    • http://itclick.pro/31808390895vsxqy.pdfIn PDF document text
    • http://begetus11ppz.xyz/227442922940hflo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_986a65a780814268b0860790da46a47e.pdf?index=trueIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/visuwimejosafofibadonupom.pdfIn PDF document text
    • http://fudajajekibow.rf.gd/logo_persija_di_dls.pdfIn PDF document text
    • http://pujusojup.epizy.com/dasam.pdfIn PDF document text
    • http://silimefepil.rf.gd/food_chain_worksheets_5th_grade.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_60288fd5cb8c4fcaa6b0638c4f6ca637.pdf?index=trueIn PDF document text
    • http://detotoga.epizy.com/lion-webelos_cub_scout_book.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_218f3ef3da5b48f69fe400c33b14e1e0.pdf?index=trueIn PDF document text
    • http://xaninulutinofeg.rf.gd/lanibomu.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_667a540482224152bbfebeafff37b229.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 5476 bytes
SHA-256: 91dc4f8afe3dce9a6747c634e3c2ca90a8c67bb6af993874735d36fb5f90909d
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 10984 bytes
SHA-256: 007a57771906edd4607c7143f422176cbccf48c39c3bfa8c5987b29712364b2a
font_02_sfnt_off00012f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333