Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ddd3e9d5045355…

MALICIOUS

PDF

81.7 KB Created: 2021-02-16 08:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 95be1825f9711682a194b083a160d14b SHA-1: 240ceb681a0edbc63775bd0d6005e1cb41361869 SHA-256: 28ddd3e9d5045355bd76cfa3a1e39ce07f7a20d477e16383cea183b78f91a62b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=gilbert+chemistry+4th+edition PDF link annotation
    • https://cdn.sqhk.co/tigixexaxi/W6WhfC4/maxis_match_cc_folder_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_600de97c59f92.pdfIn PDF document text
    • http://reduslim-officialsite.site/nadoxezagoymljx.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/fggyggB/wink_smart_home_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/htOPmBR/silver_dollar_city_branson_missouri_schedule.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/lanaxep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_5ff3f72b426d8.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/porexosalokekuxiganefrheks.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ggl6iaa/darufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386824/normal_5fcf0b949685d.pdfIn PDF document text
    • http://nasporte1.fun/misak1k10y.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/gjpXEih/history_vault_app_on_firestick.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_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 5332 bytes
SHA-256: 56805696da8d96a1562473589ff31fe39c4688b5c9f447a451ea62cde31a4a0a
font_01_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 11112 bytes
SHA-256: 073fefd682a39286acf34e707ba162b4046861efd837c14ad5d833c931c35928

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