Malicious PDF — malware analysis report

Static analysis result for SHA-256 336c5cc85740938b…

MALICIOUS

PDF

77.3 KB Created: 2021-03-21 04:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d6c5ab95924d02437faac50815fa478 SHA-1: d0d700bd302b345f07076ba43fa7995f7ba2ad53 SHA-256: 336c5cc85740938bf39a4d7f2ad290e056fa921ee34cce4ce182e6172c4d85d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=oshe+di+5-7
    • http://coupons2020.info/la_crosse_technology_clock_manual64xqe.pdf
    • https://cdn.sqhk.co/pefevepufi/ibiiD2l/fipedusejazuxo.pdf
    • http://onlineeshop24.xyz/6160192297oxyoe.pdf
    • https://cdn.sqhk.co/tixunudixa/jfhg61p/pixel_maker_pro.pdf
    • http://trysalon.xyz/how_to_prepare_used_cooking_oil_for_biodieselzen2v.pdf
    • https://cdn.sqhk.co/daborofus/hfAhdjh/borejiwumufol.pdf
    • https://cdn.sqhk.co/kasesiseb/Eijhdgs/landscape_architecture_history.pdf
    • http://tigafik.mygamesonline.org/73749791761.pdf
    • https://cdn.sqhk.co/fogizotufijo/8ibjgje/forma_de_chocolate_de_videogame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cdebc474-2fb1-44c7-9052-bdee23d2438d/xaxaxusigegananoben.pdf
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_1232e4152c22484da737e928fa4b0cd8.pdf?index=true
    • http://bavotuvezomevi.myartsonline.com/how_to_interpret_data_in_a_table.pdf
    • https://uploads.strikinglycdn.com/files/014f61a4-00f6-4dc1-aa4b-dbd6279d2786/zevaxegijuporuzemuvasi.pdf
    • https://uploads.strikinglycdn.com/files/ede97012-13e1-422e-b206-db379b42b5c0/46508421499.pdf
    • https://uploads.strikinglycdn.com/files/146a97a0-5c78-47b3-84fe-7fe71a16cd5d/pathfinder_dragons_demand_maps.pdf
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_cef3e1ecf2f94f89a3d8a684645ca8ed.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e5.bin
b6097d84e36494034595abb3e2df9df405b3f89b06ae1c99f25686f99a224ae7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 4840 bytes
font_01_sfnt_off0001026a.bin
607784a051e026a4bf8be5cf7593565ace05ebebab88690641a54e8c96deb614
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 11392 bytes