Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de5fe718e039986…

MALICIOUS

PDF

73.9 KB Created: 2021-04-05 20:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c6afeff34ed00589368d15b288a1bc SHA-1: d81e8fd2a5eaad5325c2bc93b7e0df28e9781db6 SHA-256: 1de5fe718e039986cc6647213348fa0257974fc6e0a98900803b7c888ae41dc5
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a phishing or malware distribution site. The document body, though heavily obfuscated, contains keywords related to PDF highlighting, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/award?keyword=koreader+highlight+pdf
    • https://static.s123-cdn-static.com/uploads/4377101/normal_60086cbd7f90e.pdf
    • http://xilibinebosapeg.mywebcommunity.org/jominedoba.pdf
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/xawojig.pdf
    • https://ledobosu.weebly.com/uploads/1/3/1/3/131383424/7995225bd01.pdf
    • https://cdn-cms.f-static.net/uploads/4454672/normal_605558ede8710.pdf
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/072ff80f266.pdf
    • https://cdn-cms.f-static.net/uploads/4502439/normal_60525b4667d3c.pdf
    • https://bavamelamasol.weebly.com/uploads/1/3/4/7/134714994/5954812.pdf
    • https://cdn-cms.f-static.net/uploads/4413696/normal_602ff5087b1f9.pdf
    • https://cdn-cms.f-static.net/uploads/4483604/normal_600df8029a42c.pdf
    • http://fufejezonodim.mywebcommunity.org/vocabulario_del_medio_ambiente_en_ingles_y_espaol.pdf
    • https://kumazapo.weebly.com/uploads/1/3/2/7/132710765/9694479.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://domumulavonevef.rf.gd/logic_gates_questions_answers.pdf
    • http://balunepikejevo.rf.gd/pokemon_ultra_sun_and_moon_full_pokedex_qr_codes.pdf
    • http://vekemelegewimo.atwebpages.com/77550376902.pdf
    • https://s3.amazonaws.com/zuwosil/mulumibupotog.pdf
    • http://kususen.myartsonline.com/fundamentals_of_computer_hardware_and_components.pdf
    • http://jezevenakos.myartsonline.com/27183862744.pdf
    • https://s3.amazonaws.com/sizadagazagaj/actividades_online_palabras_agudas_llanas_y_esdrujulas.pdf
    • http://teguwawax.rf.gd/74583646270.pdf
    • https://s3.amazonaws.com/juzinaramip/39282383489.pdf
    • https://s3.amazonaws.com/winumigutam/how_to_read_the_notes_on_a_violin.pdf
    • http://wugezirux.epizy.com/autumn_in_my_heart_sheet_music.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_off0000e494.bin
01bfe98ce07e9e581cd346ebcbd46837bae0827d5e9b4b229008b5674b88d870
pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 5096 bytes
font_01_sfnt_off0000f5eb.bin
e659e1ec1b0a5141c9b67824e6d8d711bb54fbd7bfb25d20c6f8c16b551872ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10752 bytes