Malicious PDF — malware analysis report

Static analysis result for SHA-256 21209e6bd8b57467…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 19:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ff89efbe60a8e53664b76ddcf9b0052 SHA-1: b85e0e7b0d345566017e5ddeb95948929fe3bed3 SHA-256: 21209e6bd8b57467fecca36b81e8d88bedf82096240786bf7e2fe8ee82ff6f8a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains a lure related to 'python interview questions pdf free download'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://midufefew.ru/award?keyword=python+interview+questions+pdf+free+download PDF link annotation
    • http://hihikane.space/jujepr60lg.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/buxexaturelin.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/b8e833.pdfIn PDF document text
    • http://flathead.us/diabetes_sliding_scale_chart_novologn2k1m.pdfIn PDF document text
    • http://roman-holidays.shop/systems_engineering_mastersfda2q.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/toniseligiwuzux/bikusuduzibuge.pdfIn PDF document text
    • http://fodabobaxuti.epizy.com/capitulo_4a_realidades_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763cfa76-347a-4e01-9a97-931e5af78727/52864079482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9269d745-5c68-4e6b-a4c8-09882f462538/beriponupovelivip.pdfIn PDF document text
    • http://bigofuzov.epizy.com/wiwozonosifuxubeniwofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fa4143-bdda-4914-b43e-1b92b83145cb/walmart_pharmacy_vaccine_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ca86b4-d759-4c7e-ba2c-72eef92cd6d1/lobifomewojerazexofumipeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290f7b5c-6459-469b-b76f-539c8d8bbb50/79424743991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811cc8b5-57b9-4c03-af62-498bc49079f6/19044886056.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/civilization_and_its_discontents_freud.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/20848564844.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/gijaketodo.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/bsc_mathematical_methods_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf0aff0-de9a-4645-aa8c-aeb21ce58a63/2003_honda_civic_maintenance_schedule.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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 5512 bytes
SHA-256: aacfb720a531691356ed71879a56cc29fb8def451e3f52b04c35488429cba936
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10704 bytes
SHA-256: fe464dd0beae665c2849ef4ee61c54011d4a5b9e4cfd7f28442d2a39e9784a04

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