Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5fa4dba3bf23a3…

MALICIOUS

PDF

70.7 KB Created: 2021-04-04 07:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10fcf96808192f1397deffdbd17791ba SHA-1: 6e6c0badf611ff2db1c92f9c5953c53ec441503a SHA-256: ba5fa4dba3bf23a304d537daa95a06db9aacb20adc094f6903c37d6fccf4751b
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, with a high risk score. It contains an embedded URI pointing to a suspicious domain, 'resalured.ru', which is likely used to host a phishing page or download a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

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://resalured.ru/award?keyword=author+s+purpose+worksheet+middle+school+pdf
    • https://cdn-cms.f-static.net/uploads/4454988/normal_601f266f3241b.pdf
    • https://fojaruzagix.weebly.com/uploads/1/3/1/3/131379198/2290818.pdf
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fda2d22c522b.pdf
    • https://cdn.sqhk.co/jimikafede/igcide6/ping_pong_balls_amazon.pdf
    • https://cdn.sqhk.co/kupujape/hauI1zw/40830211507.pdf
    • https://cdn.sqhk.co/zulatobi/bByihui/dafub.pdf
    • https://towirakupafa.weebly.com/uploads/1/3/4/5/134595516/3178212.pdf
    • https://donobemibuv.weebly.com/uploads/1/3/4/5/134512533/493b05693ad1.pdf
    • http://afracheat3.xyz/mov_repair_free_mac8n0y0.pdf
    • https://cdn.sqhk.co/rorajakura/fwA8SOu/61537764866.pdf
    • http://hotita.space/pawimumigiwolufapcv2q.pdf
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/kokuko-logutup-puvezeliv.pdf
    • https://cdn.sqhk.co/fukonovum/ibgdggK/custom_swing_sets_near_me.pdf
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/1349523.pdf
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/1d7c660d805e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woxotopapozokev/describing_people_s_clothes_worksheet.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/36822317925.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_off0000d884.bin
0f5b6becfff002a359968f5be268dc18513850666e3171e37afd16c2052ab641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 5328 bytes
font_01_sfnt_off0000ea93.bin
202e10a0977d9fec8122748904697e6e093581cc08f1c529c14ddc1bcf9cf4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 10240 bytes

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