Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42be0b95b77e50…

MALICIOUS

PDF

77.1 KB Created: 2021-05-10 14:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5e6a477fe536c77f39a7c6f993ec85a3 SHA-1: 21e206197f23194c218975478a694fd93819e371 SHA-256: cd42be0b95b77e5030085dc68ba1c42412a15ebe7ae5932490dccd66c02ffc34
136 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a phishing site, as indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body appears to be obfuscated or corrupted, but the presence of a redirector URL points to a phishing or scam attempt.

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://bologen.ru/strik?utm_term=what+is+definition+of+waste+product PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476010/normal_60503fb40cbfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5ff86f0815fff.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/xedewofuretujo/10026028148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2546ac91-c391-4e1a-9fed-8078ebec9470/insinkerator_parts_breakdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c334b6-e89a-45b9-844f-e6df26532c65/what_age_is_love_actually_suitable_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cb8e6e-ee42-4320-928c-2c38ab14473d/tojabajekejadesur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb9b7af-7925-400c-b729-c270968708c1/sharp_20l_microwave_oven_shp-r207ek_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c71a7ad-15c8-4043-9c5b-ae0e838d0302/rixebakulokewiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e88cb4-358c-478a-b6c2-fe317db337af/bubble_sheet_for_9th_class_lahore_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b9b839-1c06-46d4-bb3c-0c3082fe5558/grohe_kitchen_faucet_leak_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d668e4c2-098f-4b45-818f-cd11b1d40ef3/21961705738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05adf87b-20fa-419e-9768-47bfc806778c/addition_and_subtraction_with_regrouping_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2567c5bf-f4a5-41c9-bef9-cc1359cc6621/53468822329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca12112-81e8-49d7-a3ab-7779a18839d7/13711146701.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/warubate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a38342-fec9-48e6-919b-90fdced9b4b9/what_are_the_biological_factors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5304f64a-5379-466c-9557-a0a8868121f1/77453798520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51de649e-9c64-4fe7-b486-777e952e17e2/66958153767.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/jutugajujefupof.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/savuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8190945d-09d5-4e45-8bc5-9bfd3db09675/los_hermanos_karamazov.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_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 5316 bytes
SHA-256: bc88583e2a4ebaebaedf6979f923044cf13f40295d1f4f60700d41c601d9f0ba
font_01_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 10832 bytes
SHA-256: 55ebd736dbef34f754755ff524841de722d39c14f76649af0865f2ea2e5267de