Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee16da470cd3c36…

MALICIOUS

PDF

77.5 KB Created: 2021-05-16 14:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8ef0ba1fdc648f097327fe26eabc8939 SHA-1: 04fa9dc9e94644bd4103d2319889cc25538b2f5a SHA-256: 3ee16da470cd3c36d2bf23740a07da1a047a9ece0c9ce6f6bd4f55d58319cf20
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external links, many pointing to disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The document's structure and numerous external links align with techniques used to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=julius+caesar+book+cover PDF link annotation
    • http://diluzadumavotux.getenjoyment.net/zuxupisatukaki.pdfIn PDF document text
    • http://tamigome.scienceontheweb.net/annual_internal_audit_plan.pdfIn PDF document text
    • http://gufutaca1.xyz/68131111049jgims.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/ramifevovi2viv.pdfIn PDF document text
    • http://goshop32.site/lugegapajidujijibefodwpmd7.pdfIn PDF document text
    • http://uscreditreport2021.info/babotupabufoveci8.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/how_to_hurt_him_by_ignoring_him.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/fovemoduzaxubagalap.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/69937504222.pdfIn PDF document text
    • http://espacecmb.xyz/50124857539e0f8i.pdfIn PDF document text
    • http://presentinsta.site/girigeluzem0562x.pdfIn PDF document text
    • http://abwaab.su/33562016749k7aq6.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/d9e335b1-16a2-4d8d-85eb-7e9832a14682/fulipa.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_1e2a509069874d71a484d0bb25da6038.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7d1636-11e6-4661-8823-cd4ea79e4252/95864215650.pdfIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_87789392ca844161a84e22953b3a56c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5260c50c-fb4f-4718-886b-3b13afdbc857/norcold_fridge_not_getting_cold_on_propane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516930a0-9b19-48d4-831d-ab5eadee70cd/liwopijejife.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_33718b390ccb4c7d9b4e19cb12353b59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44267278-4c42-46cd-9daa-3b1f7a93096d/how_do_deer_survive_the_cold_weather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6ebd0a-c2b6-4566-bbff-26075dc0d935/tafoxekajulefadize.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_8972298d5fc04dd794d9f4f976c13d88.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_98dc05d7f38043d4a68eccf74626b692.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55f5756-388f-4f19-a3f3-ac3f6da03896/dekobewoxozijapawoxigidil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37bd655-b19a-4b28-96cc-9f6f280d40a5/tegomodujiwugovegowe.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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5048 bytes
SHA-256: ffc40b45251ae0bf4856d852775747bb1245f277b227e19681f705c487de7aed
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 11532 bytes
SHA-256: 5813d74eb5d9b1b38d5f9ed69329f841fa364c859fdf12782684a7db92b16e88

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