Malicious PDF — malware analysis report

Static analysis result for SHA-256 990fea89463f4f87…

MALICIOUS

PDF

78.6 KB Created: 2021-05-10 06:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1944ceaaa514f8fd7642d9ca18b76e29 SHA-1: 2033d0250394c48dd2be0e9de53795144369e2e4 SHA-256: 990fea89463f4f8787b057fd5f6b70f79623ef582f680b6b4d3c2b45df061c81
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'xajibur.ru', which is likely a phishing or malware distribution site. The PDF structure and embedded content suggest it's designed to trick users into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=standard+normal+probability+distribution+z+table
    • https://static.s123-cdn-static.com/uploads/4412387/normal_6000d8e3f01f9.pdf
    • http://universal-kirov.ru/asylum_game_chapter_4_answersejppz.pdf
    • http://zawazubiwezug.iblogger.org/general_characteristics_of_bacteria.pdf
    • https://cdn-cms.f-static.net/uploads/4372371/normal_603f0e132d96e.pdf
    • http://50offstore.info/63352092301q3f69.pdf
    • http://rentline.pro/north_african_originnrzhl.pdf
    • http://boxberry-24.cc/will_tokyo_ghoul_get_a_remakes5jwj.pdf
    • http://megahit.space/532374493777g6ia.pdf
    • https://cdn-cms.f-static.net/uploads/4425009/normal_606e9f3bdad47.pdf
    • http://gegapaxibu.22web.org/how_to_use_a_true_metrix_air.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fabodatutowew.epizy.com/66967985305.pdf
    • http://pedijuwugeta.rf.gd/estar_command_forms.pdf
    • http://peruroz.onlinewebshop.net/anxiety_and_depression_among_college_students.pdf
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_a83bf131f0cb4389aa40ebe7ff2dfc83.pdf?index=true
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_8a4bc6a3c24e4569b5caa2e0b45044e0.pdf?index=true
    • http://lixugafepujijoj.onlinewebshop.net/82399541709.pdf
    • http://wetizizokixo.epizy.com/29007654023.pdf
    • http://rojuzejuleg.rf.gd/el_libro_de_los_anunnaki.pdf
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_d2699e00326f4207a9f3e670005873f0.pdf?index=true
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_155b6c1fd0424a1db47dc3bebf2e5fe0.pdf?index=true
    • http://redepulevinevux.epizy.com/jixipiweduxu.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_off0000f1b7.bin
41c80ef3f8f19a689dd46e92a81ffaf7b2d75445414f36ac1e108bb2aeb07195
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 5500 bytes
font_01_sfnt_off00010456.bin
80c74f49aca71e2e1b072b7017e9c680d36eb7fb085861d6a2c34581b2d6a1a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 11436 bytes