Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfbfd63f2818b26…

MALICIOUS

PDF

83.2 KB Created: 2021-03-20 17:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79c4faa1c85dcb47dbb420c48559416c SHA-1: b54db96018a14e79586ff3b39a15d77b7495e074 SHA-256: 2dfbfd63f2818b26a40596c995f89c173ffe3c851f17426d2ed9eac734f39f67
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to SEO-optimized PDF files hosted on various platforms. The primary URL, https://druttle.ru/strik?utm_term=how+to+write+a+good+mental+status+exam, appears to be an SEO redirector, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=how+to+write+a+good+mental+status+exam PDF link annotation
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/zipolobeda-pajukuxo.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/7415234.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/pheNjIA/kofixa.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/capresso_coffee_grinder_setting_for_french_press.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/hzhitjf/ziwavetef.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/ghjg9ha/best_player_movie_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/gjQoI2N/36653180446.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/nilititonawafim/warlock_guide_wotlk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04241d09-d8c3-4d76-9478-e467b46f1d35/vampire_diaries_cast_season_4_professor_shane.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/port_greek_latin_roots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff97f5a-624a-4b38-9b8a-bd3cc0f68959/22531061411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3126c78-814d-4ac6-80df-2378e270af3f/software_project_management_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/rujobuvidogifonu.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/hp_elitebook_8570p_wifi_drivers_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/rijad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ea8e1a-eb9c-478c-adf9-edcd29579f15/what_did_the_us_gain_from_the_treaty_of_guadalupe_hidalgo_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5c2f27-67ca-4d34-94b0-2bbaaa4e3c67/how_to_adjust_bipap.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_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 5264 bytes
SHA-256: a33f2d953bd9f7d491a48c81dedd443e06fdcc506ed5f1d941e35f78d3208f70
font_01_sfnt_off00011a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 11000 bytes
SHA-256: cf2e220a4bbeabbcc44445a38a12ddc35eb8a1efabc615f1cb577497e72bc9b7

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