Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad3c0c1d53e2395…

MALICIOUS

PDF

68.0 KB Created: 2020-11-11 08:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9d56992004c0497a3ab70b8dd158a783 SHA-1: 240cf9a7cad6ddf5152ba47135611ec7fc95fac3 SHA-256: dad3c0c1d53e239526de86590198c4c5a2c43706d6ab0900731ae1f3cf113be3
186 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 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?keyword=anderson+middle+school+missouri PDF link annotation
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/resimogapukizudel.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/petujeme-befefasu-bijov.pdfIn PDF document text
    • https://robonodibogiva.weebly.com/uploads/1/3/4/6/134630072/6423916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5fa79551a1709.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/xewuj.pdfIn PDF document text
    • https://sezemizom.weebly.com/uploads/1/3/4/6/134622585/7561082.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/7819408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f8c5ee99ac7c.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/ca5cf8b92d.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/5ef9a610-68ac-47f2-9790-ff0c2605fd03/unaka_high_school_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ec8577-6667-4883-95a4-e52c4c2f3f56/eighth_grade_math_minutes_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173588ae-42d4-48e9-9301-e3f1229728f4/too_long_in_the_sun_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c63d8a-d7fa-4071-8ac1-a94d8339cfe6/epson_ultra_premium_photo_paper_luster_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/vumozixasi.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_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 4956 bytes
SHA-256: c3acede01be20847efa894aac2b3a04e3f5c7a9f5cc2d9489d709591877de9e0
font_01_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 11468 bytes
SHA-256: 5536086002483431c0059935d1f442ab0d09ccf049d14b22a312f81ed8546f77

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