Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10b7aad4bcfa218…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 13:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 309262084d05fb324fc28699a2eb3646 SHA-1: b3619a6610554efea0c40d25c8a3c6e705f747d8 SHA-256: c10b7aad4bcfa218e1b4aba046cfb41945a37e0d8f64533e7a056b61f906d97f
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file. Although no scripts were explicitly extracted, the PDF structure and embedded URI indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=hindi+play+scripts+pdf
    • https://cdn-cms.f-static.net/uploads/4368951/normal_6015988d39092.pdf
    • https://cdn-cms.f-static.net/uploads/4464525/normal_603b1ad4ed6f5.pdf
    • https://static.s123-cdn-static.com/uploads/4473919/normal_5ff559142f4d3.pdf
    • https://rofupujo.weebly.com/uploads/1/3/4/3/134335987/5109676.pdf
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5ffe9d24dc374.pdf
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fd2601a0adea.pdf
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/0e3af.pdf
    • https://lavulujataj.weebly.com/uploads/1/3/4/5/134576306/1f1fb4208.pdf
    • https://cdn-cms.f-static.net/uploads/4393511/normal_602a03b22ba9d.pdf
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/vipof.pdf
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/zorumewiwugakerif.pdf
    • https://cdn-cms.f-static.net/uploads/4456369/normal_5fd39eb03badf.pdf
    • https://cdn-cms.f-static.net/uploads/4460460/normal_60171734f3582.pdf
    • https://static.s123-cdn-static.com/uploads/4487432/normal_5fcd569dae928.pdf
    • https://cdn-cms.f-static.net/uploads/4495269/normal_601f9683bae30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b40c63e3-c6f6-4d89-aef4-c044e0517b64/what_do_i_need_to_make_cajun_chicken_pasta.pdf
    • https://s3.amazonaws.com/kavifunaruvi/personal_development_plan_template_powerpoint.pdf
    • https://s3.amazonaws.com/pukaridimupo/75896563525.pdf
    • https://s3.amazonaws.com/minegikukovel/coreldraw_x8_for_windows_10_free.pdf
    • https://uploads.strikinglycdn.com/files/f104e822-8fd8-4d84-b54c-da7bf7270312/kiwutuganajaposazuzativa.pdf
    • https://uploads.strikinglycdn.com/files/1c263b5e-2083-4986-a619-e549c237fb92/best_ccw_holster_for_taurus_g2c.pdf
    • https://uploads.strikinglycdn.com/files/2f4a9398-fbb7-4a0b-a17a-a91f9aa506e0/how_to_calculate_interest_due_at_closing.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a2.bin
15ac5ec4467fb981d6bad78c09f54cf5c25b309ff593a8ee2afdf4b298c50436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 5212 bytes
font_01_sfnt_off00010372.bin
d5addcc9665c1d70e1be1b22cad60dee0727f59788e3d2457631b34c23e46bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 10564 bytes

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