Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecba86786c19ddc8…

MALICIOUS

PDF

78.9 KB Created: 2021-02-27 14:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cbd3477c7f9b0f81d52a16a87bcb7487 SHA-1: dd7a7e1f8c3595622322f79994260000b6782a2e SHA-256: ecba86786c19ddc8c41fae03fdfeaf0dbdd4aa8f455f75ee45a434c70ecc7870
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://jacksth.ru/strik?utm_term=manual+para+aprender+ingles+para+ni%25C3%25B1os+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5fe8617ac1b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_600d16bc5c918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_5fd9a6f92780d.pdfIn PDF document text
    • https://cdn.sqhk.co/fufitefan/hbWQQjf/pubima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_5fe66b6866384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_600dfb633f55b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5fee7e9297f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5fd1af72eb8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460446/normal_600d4fbc43dea.pdfIn PDF document text
    • http://leledup.mypressonline.com/kopajumasamebenedejiwax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fe345545a1aa.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://s3.amazonaws.com/teximikamukubo/fijiw.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/ap_english_language_and_composition_practice_exam_answer_key_2020.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/circle_diagram_of_induction_motor_problems.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/minecraft_servers_1.8_8_survival.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/potipomi.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/are_flotec_pumps_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/nefijoranu.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/bookmark_design_template_photoshop.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5228 bytes
SHA-256: 9ab8918f3438631dd55e6e344ce34032cf4b374266d95161c8ed94fa2fa8e1b0
font_01_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 11696 bytes
SHA-256: eaab68cccf523101abf14181815ecdba468484a480a4499c81170d352456722c
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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