Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83d1b082788c1b3…

MALICIOUS

PDF

66.2 KB Created: 2021-01-05 19:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 056fd4ac4e2685ca039b0d8cf020d6e0 SHA-1: 84b61cd8fefc582c26cc503e396adf6a13651b0c SHA-256: f83d1b082788c1b3f744e7efa6d1e366acc04b34b00de38772ec52fdf20f831b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://cctraff.ru/aws?utm_term=article+worksheet+for+class+3'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL suggests the document is designed to lure users to a compromised site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=article+worksheet+for+class+3 In PDF document text
    • https://gewusepisegetu.weebly.com/uploads/1/3/4/4/134492884/pokekuz.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/mikibuvonavax.pdfIn PDF document text
    • https://fepazizagi.weebly.com/uploads/1/3/5/3/135345318/lumamek.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/4757203.pdfIn PDF document text
    • https://kikokowenut.weebly.com/uploads/1/3/4/7/134713101/sivinijigavulekivuga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/06299f3d-2b24-4729-8aa7-b5e3e23070db/dikasujafuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a825dd-e11e-4c1f-b4c1-ff77729d28e6/examples_of_letters_of_concern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec11395-2d0d-449e-ad84-bfb1069c2fcc/jazibigujiwogoxemuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9ec9b2-ee6a-4cbc-9169-ae4393cfebea/35585045278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfa7df7-52a9-4f82-bd48-ac494a8d7080/pagulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd25302-5231-4be5-aef7-b73502c82be6/tegikobofevibajata.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_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 5280 bytes
SHA-256: f9140a1293b6c9b43383284e172e48be9a7e716d1a5e21568f57c84f3288fec7
font_01_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 10632 bytes
SHA-256: f1ad2e0ebae30c3c0b74b0edcd041f09dbaad372e38425fcbfa0ef942357aa07

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