Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1562fd55b0c20b9…

MALICIOUS

PDF

74.6 KB Created: 2021-02-13 17:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c0db357acd860158c68a824d79ab1850 SHA-1: ebac03cb28006105f8b01498df280dcba4ff6b23 SHA-256: c1562fd55b0c20b90bc42072c19f1753df00d286bf90f4d11004c0f2f5f5b918
154 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics as malicious, including a critical finding for a redirector link to a known malicious domain. The ML classifier also strongly indicated maliciousness. The embedded URL points to a suspicious domain, likely intended to host a malicious payload or phishing content. While no scripts were explicitly extracted, the PDF structure and the presence of redirector links suggest an attempt to trick the user into navigating to a harmful site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crophysi.ru/123?utm_term=comparison+bar+graphs+in+excel In PDF document text
    • http://pedalini.club/how_to_webripd6oqe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_601bb46f1e47c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5ff08cfbeea6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454162/normal_5fdde7471eaa6.pdfIn PDF document text
    • http://testvvd.xyz/panezatomixp4pjq.pdfIn PDF document text
    • http://feelslike35.com/head_and_neck_cancer_esmo_guidelines_2016cjj1p.pdfIn PDF document text
    • http://akmurzina.com/katilogawezuxumif7m5e.pdfIn PDF document text
    • http://gufutaca3.xyz/luzawepowenokat2lijb.pdfIn PDF document text
    • http://powerpoint4you.ru/61748085391awq9m.pdfIn PDF document text
    • http://drenajkrasnodar.ru/kerulowizosudovidekll797.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/tesewuwefibetidoliseto.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/bebop_dizzy_gillespie_lead_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/sisuriwovakubilugik.pdfIn PDF document text
    • http://zomusuxine.rf.gd/bookworm_deluxe_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/airplane_simulator_game.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_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 5460 bytes
SHA-256: a5ec9b42892814bca98d1a0b754cd76b2e71eb5f6fea0b685003f46ffb9e4294
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 10476 bytes
SHA-256: 79a3cb9166a7c8a6e353bbbeac10a634ad635e0294463163e14bc74cbae54f25

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