Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5b1bb98aedd70d…

MALICIOUS

PDF

72.7 KB Created: 2021-03-14 10:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a3016966c4b890d7a508e94354e718f8 SHA-1: 5ad49270db21b12f2b70f73de47b2e5f0bfd6f68 SHA-256: 4c5b1bb98aedd70d8ee0488fe7ea6d0ea7d5f557e738dc40288bba3a7b56094c
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://resalured.ru/award?keyword=adding+and+subtracting+polynomials+practice+pdf PDF link annotation
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/b570452e615.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/39645113798.pdfIn PDF document text
    • http://zujuwasatuler.iblogger.org/2008_gmc_acadia_owner_s_manual.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/gazutowunonoba.pdfIn PDF document text
    • http://kilobowomix.22web.org/mojov.pdfIn PDF document text
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/lukininomes-gimemokifara-jomulu.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/86bdf2f4-3705-41c0-ad22-e0e8ec9beee8/vezutexalopujepepazipipur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7965f9-5f4d-48aa-a872-b509955d631d/radar.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/kubiseda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcbee934-d6ad-40ae-aaa9-f9a45753597e/52698104830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bebbce06-7098-4ece-98d0-fafb3ad1c0c8/93350193476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ecc4579-1590-42b1-ae86-1ca9d620c8f2/530790343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf34196-a0aa-4a3f-8cab-807612c5797d/furepaxadefeji.pdfIn PDF document text
    • http://guduzexotozi.rf.gd/ponini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0be18ef-86ff-447b-a36a-9d298ca3d7e0/logitech_g710_buttons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b679069-33a9-47eb-b3b9-404395132661/dafatobalukujowenulaze.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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 5708 bytes
SHA-256: 82c6188bd9bce150e5d2afa2643a0b861ad1c9d69be9318a1f93fa99c18c1179
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 11260 bytes
SHA-256: f9290db58d9896cfd6bdec17433d13617697ed3c062e3e1126571836fdc84ba3

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