Malicious PDF — malware analysis report

Static analysis result for SHA-256 041b44ab545965c3…

MALICIOUS

PDF

75.2 KB Created: 2021-05-01 11:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fc1e9ae479187c4a3a5a2900a76bb5b SHA-1: 765c42d050acb6e53d706f8a6ff6346bd4f7c1b0 SHA-256: 041b44ab545965c3d6a8965e1c1b4a4f0a4001ecd5109ed7110c622a2efe764d
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a malicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, includes text related to 'Clases de amplificadores de potencia' and the wkhtmltopdf tool, suggesting a lure to a phishing or malware distribution site. The presence of an external URI and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=clases+de+amplificadores+de+potencia
    • http://bonus332.site/directv_remote_control_codes_for_samsung_tvg7uox.pdf
    • http://thehensleys.org/61729700475hna16.pdf
    • http://small-italy.space/123520413624t5e5.pdf
    • http://fujigukatujewu.medianewsonline.com/the_absorbent_mind_maria_montessori.pdf
    • http://cetakchantek.com/polaroid_onestep_600_land_camera_manuallqfrw.pdf
    • http://rating-bookmaker.ru/zujumizebawastffm.pdf
    • http://criticcxck.space/helicopter_2d_cad_modelrnr50.pdf
    • http://domavera.ru/thwaites_1_tonne_dumper_operators_manual4enmx.pdf
    • http://netewe5.xyz/gioteck_vx_2t88ra.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_e260ef95d8c74d288b66177e65e515e6.pdf?index=true
    • http://zepedijuva.epizy.com/candyland_board_game.pdf
    • http://vodipofasofuf.rf.gd/bergey_s_manual_of_systematic_bacteriology_notes.pdf
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_7579a8290dfb49f589087924bc8a50ab.pdf?index=true
    • https://s3.amazonaws.com/xutomoxu/35642371786.pdf
    • http://nukivamo.myartsonline.com/subject_verb_agreement_worksheets_with_answers_7th_grade.pdf
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_7d29887f7ef74e6fb149fc88eeefc24c.pdf?index=true
    • https://s3.amazonaws.com/jeromopelurab/add_outlook_account_to_google_calendar_android.pdf
    • http://besarod.rf.gd/immigration_rules_appendix_fm.pdf
    • https://s3.amazonaws.com/gopuze/beats_wireless_speakers_manual.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_off0000e7df.bin
b72dfa503077d9d4f3afec8fa3d4f9b1cd847bdc0a233ad64f3a60b3fd8cda86
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 5208 bytes
font_01_sfnt_off0000f978.bin
520ffc771afd40c8c5ec81beefade9195667744ded75791b8797e50ebece16cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 11112 bytes