Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c70d4c376c53d8d…

MALICIOUS

PDF

71.0 KB Created: 2021-02-23 03:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2c72d7ad69cb11b4e39b9e1a700c4f6e SHA-1: 6321acb9e17f8225ee21b3ed866bf65b17e3debc SHA-256: 5c70d4c376c53d8d0cee1e75a4340ccc134ae72741454e5d5fdc56d80ca28668
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically pointing to a site that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document's content, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wix?keyword=equivalent+proportions+worksheet+1+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481990/normal_5fe7a2c07a498.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/sebilugetijogstli.pdfIn PDF document text
    • http://basiditdcf.space/90750647524z42ix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481403/normal_5ff64ee9dccd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374532/normal_5fc7002ed1753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_60150d46b8908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499021/normal_5ffe6d6aebbd7.pdfIn PDF document text
    • http://promooffer.site/75482363942o0eu9.pdfIn PDF document text
    • http://perevod24-card2card.site/osha_safety_glasses_side_shieldst1m26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424378/normal_5ff9c88ab1bce.pdfIn PDF document text
    • http://vekvelo.ru/bmtc_recruitment_2018_key_answerzfftr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468563/normal_600592d26a247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495244/normal_5ffa3956564a0.pdfIn PDF document text
    • http://sks-expertiza.ru/jesevo51c7r.pdfIn PDF document text
    • http://digtalcaliper09.xyz/56320485686jetvg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/blocboy_jb_look_alive_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/acknowledgement_for_report_practical.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/vacation_budget_spreadsheet_excel.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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 5360 bytes
SHA-256: cb86bf6c8ec3abdb41ef4df7fa0b049b1f8a24528ec6e214f1c7e9842d6c8992
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 10180 bytes
SHA-256: b90783197a3de43ff7fbda8334276ebf36772db9a59f76aba6883ed069f78aab

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