Malicious PDF — malware analysis report

Static analysis result for SHA-256 c945f39a2f234470…

MALICIOUS

PDF

70.5 KB Created: 2021-03-22 06:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bc86086f0b766239bd5f4746efc19dc SHA-1: 7eed415ce9b2ce6fec2812642ade768c5aaad306 SHA-256: c945f39a2f234470fd0c9b05f30ec42a2917100d381a7ed8bb8a01b9288dd729
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://jacksth.ru/wix?keyword=cell+division+gizmo+worksheet+answers', which is likely part of a phishing or credential harvesting scheme. The document body, though partially corrupted, suggests a lure related to 'cell division gizmo worksheet answers', further supporting the phishing pretext.

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://jacksth.ru/wix?keyword=cell+division+gizmo+worksheet+answers
    • http://dsv-trening.ru/116592820hu3td.pdf
    • http://prod-fruit.space/8480709284v9b1u.pdf
    • http://stickerrus.ru/koln_concert_transcriptionua5vi.pdf
    • http://podarokinsta.online/quicksand_nella_larsen1h1fc.pdf
    • http://amsidisi.xyz/what_crimes_give_you_the_death_penaltye1v9m.pdf
    • http://finansi-7.online/228734649902zx3u.pdf
    • http://rodina38.ru/meludonalidisomobpng1j.pdf
    • http://wonder-ita.fun/14883625295mxll2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sutawowirosuvuv/plague_inc_evolved_nano_virus_normal_guide.pdf
    • https://s3.amazonaws.com/fokapikow/vetiwiloberof.pdf
    • https://uploads.strikinglycdn.com/files/badbc2fe-1e82-427a-a23b-e038775523cb/dr_brown_sterilizer_how_to_use.pdf
    • https://uploads.strikinglycdn.com/files/5430b63d-44f7-4322-aae0-2e9df0ce25e6/inversion_table_fold_up.pdf
    • https://s3.amazonaws.com/jemisajoda/redexelevunukotugedefale.pdf
    • https://s3.amazonaws.com/ruzaganog/xewebafiwur.pdf
    • https://s3.amazonaws.com/pusolefosex/basic_spanish_words_and_phrases.pdf
    • https://uploads.strikinglycdn.com/files/7ffa4e86-0edf-4cb9-a5b7-e62037679a78/cuantos_metros_tiene_un_lote.pdf
    • https://s3.amazonaws.com/sakaburepagase/kusafuvumodujezogo.pdf
    • https://uploads.strikinglycdn.com/files/9fa3758d-ad82-4557-bb8c-b919659d4fb3/how_to_clean_reusable_mop_pads.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_off0000d4f1.bin
fdaf45429d4d8c5fb5dc07e745ab7e4550f3347db359d34b978367d0dc7a4c57
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 5408 bytes
font_01_sfnt_off0000e73f.bin
b9c7c98c2673a2c6e1f353ccc40e0d702dd9ed1e517fbeaa0de719cd560a91ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 11108 bytes