Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d53eef4151b3b41…

MALICIOUS

PDF

86.5 KB Created: 2021-06-03 12:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ea7076b60ad7a35cab607af1538798 SHA-1: fb6860343fa6dfec5b7907f8c5de11c3efc908af SHA-256: 2d53eef4151b3b41376f39bcffc010d9446feba01a646b1b0d46e3e1a6975b3d
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a worksheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://infrive.ru/pbw?utm_term=balancing+chemical+equations+worksheet+intermediate+level+answers
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5ffe71af0ff23.pdf
    • https://static.s123-cdn-static.com/uploads/4427514/normal_6007ff19c98e6.pdf
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5ff3841e0b2ea.pdf
    • https://static.s123-cdn-static-d.com/uploads/4383471/normal_60b6b7d69262b.pdf
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5ff20466a786c.pdf
    • https://cdn-cms.f-static.net/uploads/4419452/normal_60353c2c631c9.pdf
    • https://cdn-cms.f-static.net/uploads/4458163/normal_601481447d84b.pdf
    • https://cdn-cms.f-static.net/uploads/4488139/normal_6047bd50b38a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ebd54762-8cd5-41cc-b2e7-e5c7abe09aa7/300_blackout_147_grain_load_data_h110.pdf
    • https://uploads.strikinglycdn.com/files/1af0b38e-1bdc-4791-a7e1-2cffa6b2bea7/jodomodexagu.pdf
    • https://uploads.strikinglycdn.com/files/394f00e2-bd15-45f5-9e31-07fb5368d80b/how_to_replace_the_seal_on_the_bottom_of_a_garage_door.pdf
    • https://uploads.strikinglycdn.com/files/951307ca-af3e-44f0-be73-31a2fff51aac/modo_de_produccion_feudal_en_mexico.pdf
    • http://rasovuxosew.pbworks.com/w/file/fetch/144458268/is_revolut_for_business_free.pdf
    • http://kuzimotum.pbworks.com/f/how_to_reset_xfinity_tv_box.pdf
    • https://uploads.strikinglycdn.com/files/de12c028-f9da-4ad2-99b7-c0ce7d21fa2b/ignou_b.com_fee_structure.pdf
    • http://barumena.pbworks.com/f/how_to_make_a_probability_distribution_table_in_excel.pdf
    • https://uploads.strikinglycdn.com/files/ecb56417-4e08-47fb-8dcc-0f208e2d46a2/bawot.pdf
    • http://kolasotosexu.pbworks.com/f/happymod_apk_for_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/5abed5ad-41d1-41cb-b324-69f887820fec/zewireguwe.pdf
    • https://uploads.strikinglycdn.com/files/e9773925-9599-4027-a2e1-b136dd6b3402/41233648500.pdf
    • https://uploads.strikinglycdn.com/files/25153ff8-21bb-47f1-a6f4-b2c2d72afb24/ohms_law_worksheet_13.3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001028b.bin
d2f9463b46b50ae88e595dc75d04546bd7ee093e1379886d6584857ba811049f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 5628 bytes
font_01_sfnt_off0001157e.bin
2fac4d25ad19b5a0b98f4dc94d8d75be8744eeb478f4bcececdeed4b8e6f6076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 11288 bytes
font_02_sfnt_off00013bf2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF2 4324 bytes

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