Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbafeabe63cdd84…

MALICIOUS

PDF

87.4 KB Created: 2021-04-07 10:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b65d72e2a9ff4c4577fb0f2580654caf SHA-1: b3ad9de074d0e8bd5d707b089987daa39e68722a SHA-256: 7fbafeabe63cdd84b0861f042384d0151e347031236915cd11bd28581a9dce00
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity rule indicating an image lure linking to an SEO redirector for phishing. The embedded URL points to a suspicious domain, likely serving as a landing page for a phishing campaign or to download further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=sodastream+jet+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487622/normal_6040b4d8e9d62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388048/normal_5ff56346733f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460266/normal_5fcf9e68ed610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5fffa164a01bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459469/normal_605506204b578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5fe903001c826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_605f5a3009a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_6052dfea1fb0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_600f02c0879fc.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/fajujiju/23707843617.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_b106b9f20a914eae8f81a548f65a67d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefejevife/690931634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a63a25-d423-428c-9bf9-a7e4c98bc6b7/did_tris_die_in_the_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b41371-a70e-4f22-b078-ebbbb58a6203/22430476880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a7754c-80dd-414b-9ef5-038986db212c/how_to_light_up_a_rheem_water_heater.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_708c1bcb363849b296ca511c8095ad38.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_b889b6599b7143b096c51bb13abbe4ab.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_de31c336463045348bd4f0cb1f4af2b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/100_ways_to_motivate_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/larval_forms_of_starfish.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/esmeralda_skill_guide.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_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 5424 bytes
SHA-256: 49fd168d3fbb896abf745d2baef3b40d4a4198dd3d1e4ad74915d2204b229afa
font_01_sfnt_off00012b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 10768 bytes
SHA-256: aa1893985fca6d01cd536334049db9eff4230007cf8975dc3a914ee16c353828