Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5941f887e23fdb…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 11:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5024539f2352a378703851c8827ece7 SHA-1: 750d2b9491083b36b6466fcf4f67b401efbce1a7 SHA-256: 1b5941f887e23fdb43c312ddad6704087b7a33a02c244b13ee79db749762a22d
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a malicious payload or visiting a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the presence of external links and the nature of the heuristics suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=peter+kreeft+handbook+of+christian+apologetics+pdf
    • https://cdn.sqhk.co/topefebi/ioVbric/the_advisors_alliance_eng_sub.pdf
    • https://cdn.sqhk.co/bimolixumotu/jjIgche/21116409049.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7bc12297-baaa-4a76-a8a4-34da97f814a2/dyson_dc23_motorhead_replacement.pdf
    • https://uploads.strikinglycdn.com/files/3f7b4a55-7166-4736-a279-8038f0e2948c/7410176640.pdf
    • https://uploads.strikinglycdn.com/files/3fbc8fa7-f002-4ffa-9046-fabd50411e6c/kulimatopubipemapi.pdf
    • https://s3.amazonaws.com/lupebesu/bluestack_app_player_free_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/d491826f-d2f7-4ac7-88da-9bb2456602d3/do_subarus_have_bad_transmissions.pdf
    • https://uploads.strikinglycdn.com/files/1e0a5b05-e4ed-416d-8d96-ebd9a3102d47/physics_1_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/8c0465a3-d88c-4bad-adb8-04c2d0870f6a/12835109906.pdf
    • https://uploads.strikinglycdn.com/files/648e0672-c074-434a-8053-39a2a4343d39/jivokejixaruzunekiwaxinij.pdf
    • https://s3.amazonaws.com/dufekifaral/63502908222.pdf
    • https://s3.amazonaws.com/dofufiri/lagu_blasta_rap_family_2017.pdf
    • https://s3.amazonaws.com/venunamazozuzo/kapekilurifusalagabemagew.pdf
    • https://uploads.strikinglycdn.com/files/dc3ba301-3d7b-4f1a-bc75-5a7e3ae28db5/how_to_get_sound_on_motorola_baby_monitor.pdf
    • https://s3.amazonaws.com/kozewuposoridil/favejazusubosemixovove.pdf
    • https://s3.amazonaws.com/tiduro/how_to_connect_audio_output_to_samsung_tv.pdf
    • https://s3.amazonaws.com/pizivurapab/boporofonepopuruk.pdf
    • https://s3.amazonaws.com/nitatotol/24818761153.pdf
    • https://uploads.strikinglycdn.com/files/8bafd9c3-f029-4c8a-ba99-794be2e6e52a/jbl_flip_5_vs_charge_4.pdf
    • https://uploads.strikinglycdn.com/files/b34f8836-d611-4424-8885-04fbefeddd1d/how_do_you_hard_reset_an_amazon_fire_tablet.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_off0000f428.bin
a472e762167d3ad1911d1a52075daa002f5422f65abbd259bcdde9bfc1a66cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 5624 bytes
font_01_sfnt_off0001073e.bin
3ab62b40429a82cee5d8a396be7a2f020c13bfc29cfab78e59eb196a93cadba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 10684 bytes

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