Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e63d41ebf7f9c08…

MALICIOUS

PDF

71.7 KB Created: 2021-02-25 08:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 755d5fbb26cdffdbe6b9211bef8478af SHA-1: 3c2433b9229c5b54e612c5ae9dac47772e5cba4a SHA-256: 7e63d41ebf7f9c08cbef03358aa63923aba23a5073c21d2c814874a542929e2a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to trick users into visiting potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://yafferge.ru/award?keyword=resumen+capitulos+sapo+y+sepo+son+amigos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_601b65d932bff.pdfIn PDF document text
    • http://teenagetutor.online/riddle_in_hindi_with_answersl6xax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_6017ced7119c4.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/ghqPHG5/26917398038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497346/normal_5fecfdfacca94.pdfIn PDF document text
    • http://1freedom.space/how_to_make_a_persuasive_conclusion8edlv.pdfIn PDF document text
    • http://flymoney.net/617805062323d4dc.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/romigutenezuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/1ib27lK/gumball_watterson_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/filovosa/ejcthEV/harvard_business_review_costco.pdfIn PDF document text
    • https://bejizasidofivi.weebly.com/uploads/1/3/4/2/134234705/sakanelalopizaw.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/6963867.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/sobitobadugubidutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 5268 bytes
SHA-256: a037067d62ea7878f53f182e8934e8049c4603c5e789a7ff45ce11be5c31134f
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 11800 bytes
SHA-256: 57fad05e8da5729992f6fa573ef595a222f5a9395acaa3657f30399e2a39b5ff

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