Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36b900b76a341c0…

MALICIOUS

PDF

73.4 KB Created: 2021-02-11 15:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5492bacce8fc302f1f1b0faa84b257e8 SHA-1: 77409a937b1f209b8930863b5e79b839197a9976 SHA-256: c36b900b76a341c04ed034c41346f75a95f929a89777d557a0acd2cb07ba5a42
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

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://baarspo.ru/123?utm_term=apa+reference+for+the+bible+niv PDF link annotation
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/debenugelejojubivaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_6000cb4d7f595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_601253ab246db.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/off_balance_sheet_liabilities_meaning878u8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5feb6dd8a5666.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/e4cccf57929ed0.pdfIn PDF document text
    • https://polerobozugewif.weebly.com/uploads/1/3/4/3/134344868/23090.pdfIn PDF document text
    • http://marinarus.space/61253510638ygcwj.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/runupev.pdfIn PDF document text
    • http://all-gopro.com/launch_trampoline_park_methuennokp1.pdfIn PDF document text
    • http://com-signto6.xyz/halliday_resnick_krane_physics_volume_1_5th_editionc6x1l.pdfIn PDF document text
    • http://gerisekazaleg.22web.org/example_conclusion_for_chemistry_lab_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5ffcac126929d.pdfIn PDF document text
    • http://amsidisi.xyz/risk_analysis_process_stepsukk1w.pdfIn PDF document text
    • http://otomail.business/candide_librettozjclj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujafinu.epizy.com/54076869227.pdfIn PDF document text
    • http://dovelarewiju.epizy.com/vatogigenogejexiroje.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_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 5112 bytes
SHA-256: a907d4ddd2ca6dd5c3becce3a587cd31712465d771898ede10344e54c635c4e8
font_01_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 11148 bytes
SHA-256: 5c2a1341eba1432988b3bc4eb210fded4dec3664fadc1056ba75512d715aa767

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