Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24bdcf247c225a5…

MALICIOUS

PDF

97.6 KB Created: 2021-03-27 18:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0b514351f4d8ffb71b4ddc6cd2e782d2 SHA-1: d9d4a9e2a9483a8a0899ed7eff23af2fd76d08d3 SHA-256: a24bdcf247c225a53cc6bb9dc367c9a3a3ffc158b05bb1be623f0d303e6812e1
136 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified an external URI and an SEO redirector link, suggesting a phishing lure for free downloads. The embedded URL `https://mezovuduw.ru/wix?keyword=buu+all+forms+and+transformations` is the primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/wix?keyword=buu+all+forms+and+transformations PDF link annotation
    • https://cdn.sqhk.co/furigelo/qGhguig/strategy_meaning_in_tamil_explain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_6022ecc2d39ec.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/2N15IJ1/tuxikew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369323/normal_5fed1f0db50ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449768/normal_6015fee59e2ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_605bcc74b0ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6058694ca8f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60188b9dece99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_6035da50d96a6.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/vowaloririm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_60568c7cbbc02.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/a5jfubF/boom_doom_source_port_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/ZChe4jj/fapadofoligajotekax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_6017bbca290ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fdb01f1248f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_6023db4fc3fc4.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/aSjaPLh/zidivofon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459319/normal_5ff06e6c103e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378386/normal_5ff78771cbd4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4481e97c-a947-4730-badc-a25ad3a87d44/50172606039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f3e30b-e45c-4625-a074-a20f44441fde/rupipowadatunugi.pdfIn PDF document text
    • http://kurerori.myartsonline.com/96456076649.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 5380 bytes
SHA-256: 521703bf9057f396d67c7cc65c4d54b141e95108d416b5cfcb89c23eb0f9223b
font_01_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 5100 bytes
SHA-256: b4f4bbbe13cc082594bae157b83beb7c8ff1e140c3d6f1493ece0754c889ef9b
font_02_sfnt_off00015378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15378 11172 bytes
SHA-256: 02bcee338fe286643c6a6581f4884407764c665ccbd32bf8c32802df22a44eb7