Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b51ea9c4c64a0e…

MALICIOUS

PDF

69.2 KB Created: 2021-03-24 09:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e2e46653be2b7e482478456b6a211216 SHA-1: b628b2ee1c57ff091ac4ebb58dbbecde1a116274 SHA-256: d5b51ea9c4c64a0e7b2ad45e44fae1029ed8725c23b474ababe406f78def3909
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector. The embedded URL 'https://maypoin.ru/strik?utm_term=technics+sl-d2+dust+cover+hinges' is the primary indicator of malicious intent, likely leading to a phishing page. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • 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=technics+sl-d2+dust+cover+hinges PDF link annotation
    • https://cdn.sqhk.co/nisugewameru/ggOjzh6/4103440750.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/rihhhGM/police_siren_sounds_ringtones.pdfIn PDF document text
    • http://bitcoins-profits.com/beethoven_sonata_op_106_hammerklavier4to05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_600c9f09bd543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5fe792de6606a.pdfIn PDF document text
    • http://lastasked.com/vijapixanikipawawixewafochard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_605529f37d848.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/oRVjdif/30468503051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_602effbbada26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fedfa98399c7.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/dujepav/lightest_android_emulator_for_win_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fc7865-1e35-45ef-bf01-e141b4f94f56/zowoxezogetapuwesanazimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bb4cb9-7f6f-41e2-8f68-2732345bf6bd/67058136764.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/15748204340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b9011b-b601-4b8a-849f-cbdfcd50f523/77970124753.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/wamujalezatewuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/adventure_games_list_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1bdda5-37b2-4688-94d7-4a74ce17c64b/57553066491.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/kinnickinnic_river_fly_fishing_report.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_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 5164 bytes
SHA-256: eec81acf585537b75cd0e9fb39bc102eecf58dc6326f07ccf67cb064fac83e06
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 10612 bytes
SHA-256: f78f7e06db69ad0f42d356880e7b2eeba8bfc304bcc6e77ee0ba5782d3a59e4a

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