Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dd09af306ba4c8…

MALICIOUS

PDF

70.1 KB Created: 2020-11-19 02:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 30bb0ea76d653280208f6c93f727dc16 SHA-1: 5411bd80d6e8e20d48bbc24204fd41748f2d0b2e SHA-256: 25dd09af306ba4c893ca90743ee9f30eec5b6e10d4f8701ffd2056244be9327f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/strik?utm_term=download+ps4+emulator+for+pc+full+ve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404296/normal_5fb56d8b02b7c.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/25be35fef1.pdfIn PDF document text
    • https://nurerimufiwovu.weebly.com/uploads/1/3/4/3/134394752/kawiboz-pebulonefadoru.pdfIn PDF document text
    • https://xuzutewoduka.weebly.com/uploads/1/3/4/3/134364923/9820916.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/xirodokeniguravefu.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/cbb2473d-21da-48ed-ad2f-89419d004f15/a_giacometti_portrait.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/block_comment_in_matlab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078f529f-6183-43e0-84db-2d9f573708a3/50640235458.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/pathogenesis_of_tb.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/80634042776.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/vexelob.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_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 5540 bytes
SHA-256: ba041a7d078019f5bdf39506b2dbf5663a6f9dbaae9e18c152f3c4b5f2e9f42a
font_01_sfnt_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 10784 bytes
SHA-256: 345a5bfad8ff1271d20d5b82847d0ef2b93298183457abf0c457647e92cad6f5