Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05def3d46ce34ab…

MALICIOUS

PDF

73.3 KB Created: 2021-03-15 04:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ba35f72004a67b3621e94cd518a9c7 SHA-1: 52007f0a0cc59c4e0b6fa60f2ec074328bd5f6af SHA-256: a05def3d46ce34ab198c3c1566c0c475fb2b8bc8fd19ccef100a8f7484569937
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. The document body, though truncated and obfuscated, suggests a lure related to educational content to mask the malicious activity.

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://golowaki.ru/award?keyword=passive+voice+negative+and+questions+exercises+pdf
    • https://cdn-cms.f-static.net/uploads/4461791/normal_60173fb2d6e27.pdf
    • http://renijulemigato.iblogger.org/brie_formaggio_come_si_mangia.pdf
    • http://jesipuvapuse.iblogger.org/idealism_realism_and_pragmatism_in_education.pdf
    • http://doxewoga.iblogger.org/16772703656.pdf
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fe2b5f551156.pdf
    • https://cdn-cms.f-static.net/uploads/4380705/normal_603ed3ce23667.pdf
    • https://static.s123-cdn-static.com/uploads/4411922/normal_6004c48d6718f.pdf
    • http://priz24.site/hermle_clock_movements_south_africa7vewk.pdf
    • https://cdn-cms.f-static.net/uploads/4426088/normal_603cb1740563c.pdf
    • http://lewukub.22web.org/escudo_de_costa_rica_2020.pdf
    • http://idealica-italiaofficial.site/is_beats_solo_1_wirelessser9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://govuwetubor.epizy.com/lagu_iwan_feat_amelina_yang_tersayang.pdf
    • https://uploads.strikinglycdn.com/files/25cabf11-6a0b-4deb-8879-ca637e9a4394/oracle_sql_developer_download_without_login.pdf
    • https://uploads.strikinglycdn.com/files/aff51f25-1c52-44c0-a274-2473d1e778e4/xedubufopezedejep.pdf
    • http://podepabat.rf.gd/does_canon_pixma_tr7520_come_with_ink.pdf
    • https://s3.amazonaws.com/wetevali/zedez.pdf
    • https://s3.amazonaws.com/nagudo/grammar_activity_6th_grade.pdf
    • http://rurobudono.rf.gd/mizavikedidoraxosikoge.pdf
    • https://s3.amazonaws.com/busutafitufe/gejetotamepesutezig.pdf
    • http://lusujukelod.epizy.com/exam_cram_security_review.pdf
    • https://s3.amazonaws.com/vufuzewasi/fractional_crystallization_lab_report.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_off0000df45.bin
c62fe7530e7d22d216a2abcc0c9053f005111f2921983d5fec3e8d82e5f2c378
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 5544 bytes
font_01_sfnt_off0000f238.bin
76b2b54748d6d81c17a828c0f90560d6169cff3e43a1c20aa3f291e797fef914
pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 11404 bytes