Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1ccc5f7e5ddc54…

MALICIOUS

PDF

78.8 KB Created: 2021-03-24 05:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f86365af361acddf49d9a3d8cb23d2cf SHA-1: 77fb53b7ba31e40ad184514804742351b16cb66d SHA-256: bb1ccc5f7e5ddc540eb57552ec261be4f95c44ce3d533342d512a1e107ab868e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a heuristic indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL, https://maypoin.ru/strik?utm_term=the+story+bible+for+free, is the primary indicator of compromise, likely serving as a gateway to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/strik?utm_term=the+story+bible+for+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5fca8b63891b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd87fb56528f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_6027975ba5825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_604acc80144ee.pdfIn PDF document text
    • http://waxevamebe.22web.org/29806261111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_602908956e89b.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/zozuxukoxo/free_printable_star_template_large.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/32340868337.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/low_carb_keto_food_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804c2385-30dc-4d5a-86fc-3667809e9609/how_to_use_a_haier_washing_machine.pdfIn PDF document text
    • http://vilawemozasiti.epizy.com/jezumevosaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af911142-a532-44fc-ba5a-7b2b095378c7/vosogepumom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3772b7f8-e7a4-40a3-ac91-afbf10bda736/laxogotokuvesux.pdfIn PDF document text
    • http://gizufaw.epizy.com/manuel_altistart_48.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a84b7b-e297-4714-af01-0015b0457ba7/4964588683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c464cf7-ca09-48cc-96d8-eef321936930/nessun_dorma_sheet_music_soprano.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/pdf_file_compressor_to_1mb.pdfIn PDF document text
    • http://jabulimoj.rf.gd/brian_weiss_libros_en_espanol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b665ab-cdb9-4297-8d00-d42dfce3682f/69103156825.pdfIn PDF document text
    • http://wexekokapirukam.rf.gd/fios_g1100_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/highlights_hidden_pictures_answers_december_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/dofunupunowepo.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_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 4836 bytes
SHA-256: f0dfa5c6224d5deddb9149b0b4b3e0aea2121bc3f298c883c7b95f182a6944fc
font_01_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 11404 bytes
SHA-256: ad8262d42320326642ad7c42707ef170e322e525a715c4e39cba4cd7dd2ccf0b

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