Malicious PDF — malware analysis report

Static analysis result for SHA-256 17376e3f17c5ac27…

MALICIOUS

PDF

120.9 KB Created: 2021-02-10 03:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 541c0317816506d13679037fa823f3d5 SHA-1: 1cf12f0cb1ab9c0552337b109e4b94090f1e376e SHA-256: 17376e3f17c5ac27ee7f656d5ce66fb57353b0ebdc1d906040702c8e9556bcb8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=unbroken+chapter+summaries In PDF document text
    • http://julaximufe.66ghz.com/lomoxelemiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450243/normal_600ecfceb8717.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/q58n9ge/mikutagokiwakazixuxav.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/aGpjHgh/fopipenatuvunugivowijuxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371023/normal_6006b2c831e02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5ff715c1be2dd.pdfIn PDF document text
    • http://tafedudim.22web.org/erno_laszlo_lighten_and_brighten_sheet_mask.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff696a333151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460231/normal_5ff6ae199ffda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5ff072a6b96a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benugafudom.epizy.com/amman_padal_hd.pdfIn PDF document text
    • http://valamujunitun.epizy.com/6849464374.pdfIn PDF document text
    • http://retesatitogeli.epizy.com/48715671441.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/wow_classic_warrior_tanking_leveling_guide.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_off0001a039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A039 5336 bytes
SHA-256: 647c80925e1f26b82bdd8ff7b9720ba915bf0d614f587b9049ff853bf83202de
font_01_sfnt_off0001b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B238 10696 bytes
SHA-256: ea7540847718d5f4a36af681c96097966e7256300c8b15322afb1fa2a52431c7

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