Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc54a866074ee23e…

MALICIOUS

PDF

83.6 KB Created: 2021-03-22 05:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 250a19cf5ac79e0f208c9861bb55d872 SHA-1: ecc8e5227ced03cc30372e947f5570555c0d4801 SHA-256: bc54a866074ee23e4f7f7d7f465bb06bfceb4c15a59187053190a6dc8aa0834d
184 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a redirector link to a known malicious domain. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of numerous links to disposable hosting and redirector infrastructure suggests a phishing or malware distribution attempt.

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
  • 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.
  • 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/award?keyword=angostura+bitters+drink+guide+pdf In PDF document text
    • http://texewofe.22web.org/90960629961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_60413aa5802df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486197/normal_600333c476ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_6021d2ddb160b.pdfIn PDF document text
    • http://xifuponek.iblogger.org/evinrude_e-tec_maintenance_schedule.pdfIn PDF document text
    • http://jaderulax.22web.org/cumbre_del_cambio_climatico_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_60147083723da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_6004fd6f446cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitovimewimes.rf.gd/amadeus_peter_shaffer.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/gadevosizalu.pdfIn PDF document text
    • http://gisuvax.epizy.com/78557433821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cceb4f8-d995-4786-ab29-069132151850/4857336612.pdfIn PDF document text
    • http://zosajaxuv.epizy.com/nationalism_theory_ideology_history.pdfIn PDF document text
    • http://livirava.atwebpages.com/fundamentos_basicos_del_voleibol_saque.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/47004264962.pdfIn PDF document text
    • http://fixadamobus.epizy.com/91431601146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d293f4-b50f-442a-af10-a74a65bef3f9/how_to_make_up_solution_in_chemistry.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/how_to_cook_t_bone_steak_on_foreman_grill.pdfIn PDF document text
    • http://tanewibuzak.epizy.com/wuturedarodakowive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e5a9a7-04b1-44bd-894b-cd4d15c931ba/keboxademo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19cab66-0edc-4627-b37d-3e6553025504/gugelonuxabog.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/87970301716.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_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 5368 bytes
SHA-256: 5d81c688260075b48a061d57fa3c733d446eaee39cb24ca86b877545f4783f29
font_01_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 12916 bytes
SHA-256: d7c5f89cb75f8e9b967d1f5a12f0942ad20ae8f9d98be3ae71097ae17e0b1302

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