Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b54f557fe0650a…

MALICIOUS

PDF

93.1 KB Created: 2021-01-04 12:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 81fad0bd5ef469f8bbb2f06a30526690 SHA-1: eef3d3cb655f4289daade57b57628aa84c611779 SHA-256: 83b54f557fe0650a594e6d97b054374ac495bc76ee5c3d893e023f71ed373a49
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links to external resources, with at least one identified as a malicious redirector. Heuristics indicate a 'Browser extension / update installation lure,' suggesting a social engineering tactic to trick users into installing unwanted software. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gettraff.ru/123?utm_term=90-110+lbs+to+kg In PDF document text
    • https://cdn.sqhk.co/fipexuwebo/MdsmAhc/love_poly_new_puzzle_game_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fe4e7dd8ab98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f97442671c25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393508/normal_5fc91ac0f12fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f8d71dda9285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5fe4288448b75.pdfIn PDF document text
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/785123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f886d5e2d79b.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/c0f9e708-0d4d-422b-b135-6e1f6fc778c1/wefabesenuzitogekosex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58924ce0-6d1d-4a04-b1e0-9092aba707df/amending_the_constitution_notetaking_study_guide_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed58ecd7-bdab-4646-a8a3-4c6ea9f001c1/desmos_scientific_calculator_chrome_extension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f905b804-0231-4a4e-acf0-eca620e9af14/cosmopolitics_lumiere_lyrics.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 5040 bytes
SHA-256: ee6b8166183c699ebfe8457e61c27540ce5f8098a8218d74e624c18e915c1078
font_01_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 10600 bytes
SHA-256: 264f9a08b207c84f32bd588fac35393d955e2b63f42bc6c8a844d80788846998
font_02_sfnt_off0001524b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524B 16184 bytes
SHA-256: f30359d92bc1e86b2a1cff925c6c9cea600cfccf1c00886ad34e5a5dc089f747

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