Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec0831c6549a58d…

MALICIOUS

PDF

227.6 KB Created: 2021-03-16 05:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cfffa697935ea781c77be68c8f84930 SHA-1: 9ce38faa230cf364d91290f8e256d94aa0c203ec SHA-256: 9ec0831c6549a58d5d0196cf3ea1076e1ec45d6ce2d471f9446cc115fdf88776
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is highly indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious verdict. The document body, though heavily obfuscated, contains references to 'Android os update support', aligning with the suspicious URL's UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=android+os+update+support
    • http://visiblawty.com/how_to_find_f_value_in_anova_tablezxwua.pdf
    • https://cdn.sqhk.co/kidatufo/bhddZoc/vesuxelegenibelirujupu.pdf
    • http://vekvelo.ru/friday_the_13th_vengeance91nw6.pdf
    • https://cdn.sqhk.co/jufulezamuko/jihaJBx/zombie_war_ascension_2019_zombie_sniper_assassin.pdf
    • http://mstmail.space/spotify_offline_installer_downloadn7u1f.pdf
    • https://cdn.sqhk.co/beratinuga/iez6ObJ/ropugikanoxolizuli.pdf
    • http://austritkfa.com/445392995885hda3.pdf
    • http://lifegirls.site/suzuki_lt250_quadrunner_service_manual6faeb.pdf
    • http://fruit-ital.space/juwiwinosumomawawesetetz9uo.pdf
    • http://wiinorama.space/xafixeloti4zdtl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/takateg/skoda_navigatie_amundsen_update_en.pdf
    • https://s3.amazonaws.com/zuxime/rapivofajad.pdf
    • https://uploads.strikinglycdn.com/files/1f37d80d-6eed-4d6b-bcec-3211f4a49a94/jiruxajikomizo.pdf
    • https://s3.amazonaws.com/naxozelozude/vanepurodij.pdf
    • https://s3.amazonaws.com/feborobegibew/sims_3_generations_guide.pdf
    • https://s3.amazonaws.com/vuforewebub/49248724836.pdf
    • https://s3.amazonaws.com/dedinavesute/craftsman_41a5021-3h-315_clicking_noise.pdf
    • https://s3.amazonaws.com/biwubeleba/arijit_singh_new_song_2019_video.pdf
    • https://uploads.strikinglycdn.com/files/e1b07091-f330-468e-8b51-93f50ce81950/certified_security_project_manager_salary.pdf
    • https://uploads.strikinglycdn.com/files/892b9f7c-eab4-419b-9589-a25b743fac1e/42396633304.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_off00034560.bin
a60fce34fe1201eb0c955cef685ec26ecfc560542a521b234a8fb24f29b65bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x34560 4908 bytes
font_01_sfnt_off0003561d.bin
7662c7138535fb1b609bd5232d09dc1eadd5d6a51b5a0bda6d1331b45e04f42a
pdf-font-stream PDF embedded font (sfnt) at offset 0x3561D 12668 bytes