Malicious PDF — malware analysis report

Static analysis result for SHA-256 731b2685e2db393f…

MALICIOUS

PDF

76.0 KB Created: 2021-06-07 02:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 28d72185f377d7406dddf97021ef5338 SHA-1: 05346ddca9cad470c90badcf41ed8601c76ce78e SHA-256: 731b2685e2db393f15423ee1a373d687a35be2fce0c141e84a6c8c5515b616dc
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL, identified as malicious by heuristics and ClamAV. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, suggests a lure related to educational material, likely intended to trick the user into visiting the malicious URL. No scripts were extracted, but the presence of embedded URLs and the high confidence ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/pbw?utm_term=lcm+hcf+questions+for+class+5+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443799/normal_5fefcf835c6f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_6008e4ab12dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5fff4d49478b0.pdfIn PDF document text
    • https://nexezosig.weebly.com/uploads/1/3/4/4/134460983/79a31a4f7e4ff89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484154/normal_5fcd5f2f389b2.pdfIn PDF document text
    • https://fisuxujatuma.weebly.com/uploads/1/3/5/3/135345375/zekosenum.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/xotesopitezigix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_602642525c305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_6054226aea9c3.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/gonoxi_pekebivom_guluv_zivuparokonexox.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/negemufivojet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_600f5039f1ad0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144413598/hum_aapke_hain_kaun_mp3_song_download.pdfIn PDF document text
    • http://denipugo.pbworks.com/w/file/fetch/144595074/richard_clayderman_torrent.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144752886/46099354934.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/what_is_the_nutritional_value_of_fresh_beets.pdfIn PDF document text
    • http://rubepikonot.pbworks.com/f/jevoge.pdfIn PDF document text
    • http://safopiluzaw.pbworks.com/f/tabas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd4c8b7-7399-4daa-9fab-46001996cf6d/87188120022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba9084d-8cb0-4d66-adcb-4d7b19cbb654/faferovepuwineladetepe.pdfIn PDF document text
    • http://jagimikat.pbworks.com/f/miwimifobaxub.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/zutodegavoribilugedal.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144645084/38850456706.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 5588 bytes
SHA-256: 31a89e4894d0aadef121c09352dc48a96c75cf89d30bb21792ad87d536446b46
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 11488 bytes
SHA-256: 54dcfa8eee64644ce941daa8f2b5319b400d81071e36a3d6726881482dcdc2ae

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