Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89e7f9d42691a43…

MALICIOUS

PDF

71.5 KB Created: 2020-12-26 23:53:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6aff31b51b9366926ebc532cffbb47bf SHA-1: 9638eb0e0672b3aa0f8c1f32b5f13d925df899ee SHA-256: c89e7f9d42691a43a41cb13de23f4e0938e08da5043ae6b859d22b81104d4b5a
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 0.9997

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://trafffi.ru/123?utm_term=fuel+tank+filler+neck PDF link annotation
    • https://cdn.sqhk.co/bumigorawi/36zhdAx/barbershop_course_auckland.pdfIn PDF document text
    • https://bepagiji.weebly.com/uploads/1/3/4/3/134352373/kiledoleziroju.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/jbxibhh/50962159235.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/zegegino_sivesofuna_bosasaped_futebuw.pdfIn PDF document text
    • https://zadelenipavuluv.weebly.com/uploads/1/3/4/5/134595340/lozek_filipunow_fafigiwa_kuxafonukokugez.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/2bde38af-94ca-4c00-b7d8-80f70ae92d0f/art_spiegelman_maus_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/camera_live_focus_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e523b5b5-fa22-4688-a516-06a2f305b290/79700470806.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/mayrhofen_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/27445960000.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/velewamelamotudezujedut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c45e69-8699-4e09-bffe-70d490a5fa87/tv_guide_fort_lauderdale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162a5cef-1119-41aa-900a-01907ebec6fe/youtube_bucket_list_family_kenya.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/academic_vocabulary_exercises.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 4716 bytes
SHA-256: de92256949bcef9097a602761cb645093d3ebd3ba1ff02b05843d08d3c1c119e
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 9924 bytes
SHA-256: 6ffcd7f6883934d8a00218714a631b59e3134536af18e21f8b83e61cfd4a9cbe

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