Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbb1796941b9671…

MALICIOUS

PDF

78.5 KB Created: 2021-03-24 06:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e1a3f9524e82d68ebc50941d56349f5e SHA-1: 2412a3fa5fc70aed0ca71b4f3ca66d32d195def0 SHA-256: ffbb1796941b9671901e98a01295353489784f363c6279f9fb0a817b2325659d
156 Risk Score

Malware Insights

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

This PDF file, identified as malicious by ClamAV and an ML classifier, exhibits characteristics of a link farm or phishing lure. It contains numerous embedded external URIs, with a primary suspicious URL being https://xajibur.ru/wix?keyword=kindred+sayings+pdf. The presence of many external links suggests an attempt to manipulate search engine results or direct users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wix?keyword=kindred+sayings+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466398/normal_5ffca3143d9ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fe6202ae6b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_600a6aa3c8a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_6059b57b10013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xomepixo/72318734988.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_42a63b71f55344e6bca2dcc9df80643e.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_1454cabe3af847b0a6418e2ce7f0345e.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_b85429b88c8843fe84f63f35b6c888a2.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_80c2459dfb7744ffa6802a3470ddb2d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9480d03-2028-42eb-833d-466ebde1ccc8/52562071921.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/ludisamotodorolitaxadase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2218ea68-4ea3-486f-8188-e58229f2be40/vuwozowupavabisu.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/hypertensive_emergency_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/fifol.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/fuvebufodep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de702b6-d42e-4499-9f6d-aa23f219532b/vista_128bpt_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/sengoku_basara_4_pc_english.pdfIn PDF document text
    • https://a867a740-3546-49c9-bb92-c76f735cad7e.filesusr.com/ugd/c312ff_0b85c57f195f4ca299461639ff24c20c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/how_to_make_a_lithium_battery_pack.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_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 5248 bytes
SHA-256: cb1e56f3dfa634f59744b9ace7e3bb2648293aef11aa61c5716d4389074b6849
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 11832 bytes
SHA-256: 69befbca385433edc6c3af678dd2a48189e26d0852e360679b953b34548e8f08

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