Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72cfbc9676ee4ad…

MALICIOUS

PDF

77.0 KB Created: 2021-04-01 03:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e528cd7b2e514689d24c509a341771d SHA-1: 41b32bf7b269cda253fa250031eba8d891639983 SHA-256: a72cfbc9676ee4adf79edec19fba33f9aea121acd87e1d66103d73f2b5a25cd6
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host or redirect to a malicious payload. The document body, though heavily obfuscated, suggests a lure related to free book downloads, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://dafemum.ru/wix?keyword=barbara+cartland+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4453327/normal_6014c1a2bdb4f.pdf
    • http://lirinevewafa.mypressonline.com/in_the_ditch_buchi_emecheta.pdf
    • https://static.s123-cdn-static.com/uploads/4393026/normal_5fcd99db781e1.pdf
    • https://cdn-cms.f-static.net/uploads/4471710/normal_6052d2ae66e04.pdf
    • http://tepugorotewole.medianewsonline.com/81664059778.pdf
    • https://cdn-cms.f-static.net/uploads/4378161/normal_601ee702de5be.pdf
    • https://cdn-cms.f-static.net/uploads/4369309/normal_60134b0e98f1e.pdf
    • http://xonejalevesezom.sportsontheweb.net/19987987459.pdf
    • http://want-seo.ru/hd_cinema_app_for_androidvpe31.pdf
    • https://static.s123-cdn-static.com/uploads/4475570/normal_5fe575a9b57e1.pdf
    • http://winatesef.sportsontheweb.net/fotetudojilulizit.pdf
    • http://vumejopiraxu.mywebcommunity.org/baybayin_tagalog.pdf
    • http://uose.xyz/58731598077lsgwl.pdf
    • http://xariketixagat.mypressonline.com/83185737249.pdf
    • http://cetapp.xyz/terarutaxilifonigunrkpdk.pdf
    • http://microbladingeyebrowsdallastx.com/74136949074y69r4.pdf
    • https://cdn-cms.f-static.net/uploads/4373983/normal_603a883d19319.pdf
    • http://butalinonoruma.scienceontheweb.net/animal_name_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0704a8a8-c4ed-4b9d-a7f2-e374ba3fd196/10593169819.pdf
    • http://fubavinexazixo.onlinewebshop.net/kujozevawadig.pdf
    • http://vexabimumemig.atwebpages.com/jufitodonufexufa.pdf
    • https://uploads.strikinglycdn.com/files/f6c45d54-f016-4eec-9697-08b3d84e01f9/rimas_y_leyendas_becquer_resumen.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_off0000f040.bin
b432d39f6b635b0e2688b24d24fc4296fe31f50404a6dba8427db36d3daa0b90
pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 5252 bytes
font_01_sfnt_off0001023b.bin
b67d3cd3e6b4f5c5d18b0e0b9bdd32e906b106308b65009dc5075173a205787f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 10612 bytes