Malicious PDF — malware analysis report

Static analysis result for SHA-256 a440d75d888c5eb2…

MALICIOUS

PDF

80.8 KB Created: 2021-03-28 09:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8347c0f35a4d575a1145cfa9207b20d4 SHA-1: d8646bbc83981f001b0f9042dd406587bd6a1c70 SHA-256: a440d75d888c5eb20f3cc0b1acc1920cbe4e6c9fd08834a4bd27ccb24fec6976
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 0.9994

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://kuzutuzo.ru/123?utm_term=annual+free+credit+report+equifax PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457838/normal_600835743f6db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388272/normal_5ff969e943d2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483082/normal_5fdcb3b2c8c27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_603029c3b8b21.pdfIn PDF document text
    • http://fijixedi.22web.org/32625623391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd60f4fe85a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_60059f2fa7a13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5fc7675aae0c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2702ba6d-c693-44a8-a508-54b36c816c16.filesusr.com/ugd/e745be_a9089b13f0d340a496aeeccb9bede4bb.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_226a175ca57641a787a88c680c927d99.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_6406d5adbbb9420fba6583b73c9d1300.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_42614696c86c46baa0d9b8b0c7b26c96.pdf?index=trueIn PDF document text
    • http://wabagibopuxar.rf.gd/63025306239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8b1ac2-9b3e-4015-82b3-f3f57f79288a/old_bridge_high_school_website.pdfIn PDF document text
    • http://zegaruso.rf.gd/sagaxeluxiz.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_41348afc1c3c428d91ba285076512b11.pdf?index=trueIn PDF document text
    • http://xigoraviwa.epizy.com/bussid_kerala_oneness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221909fe-b80f-41e4-9029-0663421fde8d/2012_mercury_9.9_4_stroke_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a6d1f6-8db9-44d9-ae05-ff033858038f/travels_of_marco_polo_amazon.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_0a5051e8d83c492a9e15e7d22f7403e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c8f525-4882-4fdf-b6eb-3acb3f043b94/how_to_use_the_star_chart_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227a7a41-6108-4458-959b-0e598c5d79ee/72255254640.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_da91c62c786b4bff937c05ef5cb4c626.pdf?index=trueIn 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_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 5152 bytes
SHA-256: 7f8d3dbd4daf0217e91303d14238c12e0cc1cfa9462fafb9ba639b996ee41967
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 10704 bytes
SHA-256: a44224ad597bc2d8ada9b5590bc20970ea7059e818ef73dfd7d6ef5c4d1a2f1c

Open this report in the interactive analyzer, or submit your own file for analysis.