Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb05d2768f8cb10…

MALICIOUS

PDF

70.8 KB Created: 2021-02-18 16:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28bdbafb48d10047cf18a7ade61222a6 SHA-1: 9142bdf4b5ed9106ab35c2cb1d7efbc823e71fa4 SHA-256: ceb05d2768f8cb10fb4805f04426f5658e7b4cc67781a79d2c8f1fab0de69182
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://crophysi.ru/123?utm_term=craftsman+garage+door+remote+control+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410443/normal_601fe0d64ba4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_600b209ac401c.pdfIn PDF document text
    • http://xubaseki.iblogger.org/variables_in_educational_research.pdfIn PDF document text
    • http://virona.org/golosuxutatikuorh5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6010fccf609c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_6005d7c1a0a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_5fd2afb7e3ac1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fe025af50e98.pdfIn PDF document text
    • http://bigops.fun/android_studio_update_version_numbertvjn7.pdfIn PDF document text
    • http://uchebnoe.website/epsxe_gameshark_codesdsvol.pdfIn PDF document text
    • http://soldonlittleton.com/lekilunuferenuswqpu3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_600e66883b0ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418180/normal_6004d8a1eb779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405639/normal_5ff774508afe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_6001fc5b976cb.pdfIn PDF document text
    • http://cosmosqrab.online/7123732918h94vh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzadakeju.epizy.com/beatport_er_free_online.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/answering_machine_sound_effects.pdfIn PDF document text
    • http://nekezoxugi.rf.gd/philips_pagewriter_tc70_user_manual.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_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 5404 bytes
SHA-256: 06e2e9c772de15141078e90ed17d3d4afbab552e058613391850b4b8c629a75a
font_01_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 10400 bytes
SHA-256: 2552e802b93ae1eda5fa7146813de70f74e67dc7ffb67821435490ea8c505378

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