Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54c139f1b58b58f…

MALICIOUS

PDF

67.6 KB Created: 2021-02-23 23:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d9f6f9e3bafcfb89390942086c3c41c SHA-1: 44292ffa0bef0c813caa6c28277bce8fcda3081c SHA-256: a54c139f1b58b58f26000cdfc2521d5115e48b6643598cbc728506dbf031b492
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to 'maypoin.ru', suggests the document is designed to redirect users to potentially malicious sites for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=sears+planer+molder
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5ffd543b822e0.pdf
    • http://wamuterireted.iblogger.org/getting_more_stuart_diamond.pdf
    • http://inter-kalinka.ru/solucion_salina_isotonica4go6n.pdf
    • https://cdn.sqhk.co/jafiwimeg/hihbaie/mountain_bike_gloves.pdf
    • https://cdn.sqhk.co/tenotitur/cshaif7/28839583545.pdf
    • https://static.s123-cdn-static.com/uploads/4414869/normal_60028add79394.pdf
    • http://mangalvpodarok.ru/padi_open_water_deep_divesfbg1l.pdf
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5fdb04ab6ea5e.pdf
    • https://cdn.sqhk.co/pozuwifofub/3NlpgiM/xotesolinesedaboretigonuw.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fd2593d13c15.pdf
    • http://sexesex.site/jo_badal_barse_song9ty5o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadedosi/film_battle_royale_2003_sub_indo.pdf
    • http://bopuxenuxesozu.rf.gd/zevekejom.pdf
    • http://wubulinefoz.rf.gd/befikre_movie_all_song_list.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/create_online_brochure_from.pdf
    • https://s3.amazonaws.com/pokixovuxik/mercedes_glc_250_4matic_performance.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_off0000c843.bin
abfe4935de86a2202af4667f7fc5ce7969dae7440afff239ac8228fd31b25711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 5208 bytes
font_01_sfnt_off0000d9da.bin
061ce7bcbc1732d652439eadd94eb29bdf8914c954f0ac66ae4c523c0b797663		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 11896 bytes

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