Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb50eae6a988da9…

MALICIOUS

PDF

70.2 KB Created: 2021-03-13 23:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23e3e197d91ad70a454f9febb8231be6 SHA-1: b0e70dd45fb1aa1eacf7cd65d57571b115ab76c3 SHA-256: 5cb50eae6a988da90b023edb865c91dd62473ee120332f3ab46ba7c08755c2d4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing attempt, with the primary URL being `https://midufefew.ru/wix?keyword=ama+y+no+sufras+walter+riso+libro+completo+pdf`. The heuristic `PDF_SEO_LINK_FARM` and ClamAV detection `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0` strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book title, further supporting a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=ama+y+no+sufras+walter+riso+libro+completo+pdf
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/doririgipaz-bifanupewegaj-zorimekodofonan.pdf
    • https://cdn-cms.f-static.net/uploads/4470698/normal_60244bda37735.pdf
    • https://cdn-cms.f-static.net/uploads/4472793/normal_601b0b7685333.pdf
    • https://cdn-cms.f-static.net/uploads/4481286/normal_6039f1d9056ee.pdf
    • https://cdn-cms.f-static.net/uploads/4419629/normal_6023d95010c15.pdf
    • https://ziregezetul.weebly.com/uploads/1/3/1/3/131398138/zurozoz.pdf
    • https://static.s123-cdn-static.com/uploads/4423471/normal_5ff5b7872dcbf.pdf
    • http://xigulomu.iblogger.org/dr_joseph_vitale_jr_woodland_park_nj.pdf
    • https://cdn-cms.f-static.net/uploads/4366359/normal_6010b716f11c9.pdf
    • http://rumagadoli.22web.org/giwabijizezojukabazisuvi.pdf
    • https://static.s123-cdn-static.com/uploads/4377379/normal_5fdf010c9ea6c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nukalisunu.rf.gd/57470541807.pdf
    • https://uploads.strikinglycdn.com/files/713c127b-a1e5-429b-b97d-1204a4274d89/qual_o_significado_do_domingo_de_ramos.pdf
    • https://uploads.strikinglycdn.com/files/28c7eb6a-662b-40e2-8d4c-3c461e51c188/lokinamajekepul.pdf
    • https://s3.amazonaws.com/kovilowab/tezuvane.pdf
    • https://uploads.strikinglycdn.com/files/354d29e9-5c6c-4917-955f-4b9509df39bb/817767644.pdf
    • https://s3.amazonaws.com/pululusodogi/86744495082.pdf
    • https://s3.amazonaws.com/fatikonavori/graphic_novel_vocabulary_terms.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf84.bin
7ef35b5c80106dad682d0422ef45187418cd0e5522b778fecacc7604a09ae3c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 5624 bytes
font_01_sfnt_off0000e29c.bin
c729edf239f2144a211823664f43ac1a91e9ca11f7dc0d5a30f54f6c6d389d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 11876 bytes

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