Malicious PDF — malware analysis report

Static analysis result for SHA-256 57feb4c188fd2a4b…

MALICIOUS

PDF

73.9 KB Created: 2021-03-27 22:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d4bd9be0a79dd158d031d0c15cba79b SHA-1: db213f7474827ce4f9add25cb6d11dada33d729d SHA-256: 57feb4c188fd2a4ba225c1cf8936435c845e0ce32a8e97263fc0e8b695f14a36
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 a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely to trick users into clicking the malicious link.

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://xezojetit.ru/wix?keyword=introduction+to+polynomial+functions+worksheet+answers
    • http://thrivewebs.com/vanaxipilubawuzonuwosawo7punx.pdf
    • https://cdn-cms.f-static.net/uploads/4404741/normal_60585d44bb20a.pdf
    • http://casserlabs.xyz/jubir3ithb.pdf
    • https://static.s123-cdn-static.com/uploads/4421461/normal_5ffecfbd69675.pdf
    • http://nexofozupugasi.mywebcommunity.org/food_allergens_list.pdf
    • http://accface.in/fawiwet7j0bf.pdf
    • http://dusanaputojinon.mygamesonline.org/hamlet_by_william_shakespeare_analysis.pdf
    • https://vikenefimedok.weebly.com/uploads/1/3/4/3/134390201/xabutibiku_wumefasawug_vijaro_nidurudupus.pdf
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/jeman-jazati-mezor-dukoxexum.pdf
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/a3e46fc1dcd.pdf
    • https://roxowuvunesoneb.weebly.com/uploads/1/3/4/8/134889799/gunoli.pdf
    • http://rezubodojel.medianewsonline.com/rugemejimot.pdf
    • http://saporik.scienceontheweb.net/fakizowopo.pdf
    • http://befigter.xyz/dinudasunelerebojeninuwaesx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_20630071efae4b3a9b783d22fe6fd34a.pdf?index=true
    • http://levowemorunob.epizy.com/28604518138.pdf
    • http://piranirisajape.rf.gd/biology_textbook_class_10.pdf
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_4d5ac5440d824867928a7d451204fd19.pdf?index=true
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_3428e365f1bb49d3b8a114280c90d04f.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d614.bin
5c6e93d8bab8f32b59d08229ec4f21ec3cb7eac3698426bdbce1dfc753e0a960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 5472 bytes
font_01_sfnt_off0000e89b.bin
4eae6a86c770e3df8b003f0f7cc124eb6f74cc6b460cf3a0b334946e974bec86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10436 bytes
font_02_sfnt_off00010c05.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 4324 bytes

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