Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3c36ce22a64488…

MALICIOUS

PDF

78.3 KB Created: 2021-01-04 22:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 177790d1eb06fc5187dcb62f3a7ceac5 SHA-1: 21b68514b0b5b669641d599c253433b3b9fc170f SHA-256: 6b3c36ce22a644885dd50fde74c56384efe817132c0a76290cd208a9eb5fc16a
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a lure for browser extension installation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for 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://traffine.ru/123?utm_term=free+steam+codes+reddit In PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/vixinujivanati-fubijig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f8e8e0cada81.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/hjL6jdw/jikezuwibexakumuwapojolaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/hageLhJ/spider_stickman_rope_hero_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/hiUijha/miniclip_games_bubble_trouble.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/jcNGjg7/xaxikakerup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4db07750-bbf4-4778-8555-9dad0a9d6a60/short_answer_grading_rubric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6e7dc7-4d88-481d-aaf5-50cffa3faf31/figure_8_workout_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/pojepemadeju.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/avery_5160_template_publisher.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/pebifirefoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/joyous_celebration_gospel_music_free_s.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/nazofiguwadosefugodi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 4688 bytes
SHA-256: a7f9fa8ce1aad2de11c3aaabfedff8b5ea2421711578df3d7720f7cfc5134051
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10564 bytes
SHA-256: e7e6eb47a16eb1981aeb2e1a009443d0fc78f182c3add87877dd96db8fc0f0f2
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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