Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d9f1db004e7bcb…

MALICIOUS

PDF

67.6 KB Created: 2020-11-25 02:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e84a3cf06eab3f8b7f526ac0145129dd SHA-1: 96745bed7fb64552d9e6397f48d020ed61c6d455 SHA-256: 54d9f1db004e7bcb6059febf56814a78906ea08fe84cc298ddf326c73751a669
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://traffset.ru/aws?utm_term=word+label+template+21+per+page PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5f92ae8d8e090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f934f6ac74f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5f9f9d5f794cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_5f9749b0a862f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fac2ae6202fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5faeca6aab826.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/f69dd486db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5f95d1d5eca0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_5fae2b196b8c1.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/be6cb689-3090-412a-80c8-ae69a7d2ca64/34421107539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d95dc3-6b86-4870-b82a-218ff494a056/dobisonekelirifuwasijuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ce64ef-d01b-4d94-b4ff-35822c5e08d2/winigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3badf86f-68aa-4109-b2e2-6a66182088ad/saxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe21e7ea-bda6-44fd-bbec-adb2b102997c/228644193.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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 5440 bytes
SHA-256: e20bdb762777b022e45c02a7cb3177fcd4fba2fc137173f8859a2099ef83d4c0
font_01_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 11432 bytes
SHA-256: 450a127bc3066e4886f5dff07722d0bb3bb442ff049e467978602d1b056c80b1

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