Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a041dffa61d4c92…

MALICIOUS

PDF

67.6 KB Created: 2021-03-18 09:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 170b8311ac02145dd0f288b94f02280b SHA-1: 755dc4b93ce0e5132765058a0b5abea1a1e54e27 SHA-256: 5a041dffa61d4c921c65fde158e37e6e9990ab7f8a3b60cf605695945a7c6ed0
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains multiple suspicious URLs, one of which is directly referenced by a PDF_URI heuristic. The document body, though heavily obfuscated, appears to be a lure related to printer toner, likely intended to trick users into clicking the embedded malicious link. No scripts were extracted, but the presence of external URIs suggests a redirection to a malicious site.

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://druttle.ru/award?keyword=canon+lbp+2900+toner+refill+pdf
    • http://dresdenpharma.ru/you_are_the_message_roger_ailes_audiobookfgfh7.pdf
    • http://eagleaff.com/configure_netgear_gs116_switchi4c0j.pdf
    • http://lnstagram-blue-ticks.com/divinity_original_sin_2_ryker_eternapkfid.pdf
    • http://selectgetc.top/axial_scx10_3_gladiator_bodykzwfb.pdf
    • http://sis-paypal.com/chicago_manual_of_style_annotated_bibliography_exampleafylw.pdf
    • http://osthondroz.com/makita_circular_saw_7_1_4_cordless5f8b0.pdf
    • http://womenita.fun/pikafomipebgh7i3.pdf
    • http://bio-ita.fun/how_to_draw_anime_for_beginners_wikihowvb2m7.pdf
    • http://agent-spv.space/wadobigikiwisiketevic37kr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6b06d0e-118c-4fac-ad38-87b5f8d6a0fc/prepared_holiday_meals_2020.pdf
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_fb733ffad2fa49fab9cec1eb0d7dd85a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dcce62a2-f129-4d6a-b62f-96abea2e77d0/77266329951.pdf
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_3de52794111d46f6ba4ca68e8916b992.pdf?index=true
    • https://s3.amazonaws.com/fukezavazuj/latest_john_grisham_books_2019.pdf
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_5041c3f0bc774c7b81da2c3848fdb0d0.pdf?index=true
    • https://s3.amazonaws.com/zagapaxa/60945712070.pdf
    • https://s3.amazonaws.com/legesiliv/47832809164.pdf
    • https://s3.amazonaws.com/sewamos/aikon_ak32_35a_manual.pdf
    • https://uploads.strikinglycdn.com/files/b674f1f9-c9d6-4cb4-b85e-c84954621919/are_the_vampire_diaries_books_the_same_as_the_show.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_off0000ca55.bin
05f4e313a390f92c72bf9bb61232acbf4d540a2147d0c366beb9895b6494f46b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 5332 bytes
font_01_sfnt_off0000dc71.bin
ccf7a81f3aff5e2b08f1c4418fbbc93f7bb6998030af29e4449eb9c6159fcd71
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 10872 bytes