Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd23ec5b610cabfd…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 07:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49f3733caf4122945282fd46bd7b1d6 SHA-1: 2478cddaca199e77b67bacf4a6638d3409cbb2a9 SHA-256: dd23ec5b610cabfdd578af20f9dc4e488ad00482f3a29be6c800ae76aaf35f10
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/123?utm_term=chess+game+information+in+tamil
    • https://static.s123-cdn-static.com/uploads/4417527/normal_5ff7d6531f191.pdf
    • https://static.s123-cdn-static.com/uploads/4462374/normal_5fe33dfd602dd.pdf
    • https://cdn-cms.f-static.net/uploads/4495257/normal_60371ca4cd567.pdf
    • http://timolisuv.22web.org/itil_v3_vs_v4_axelos.pdf
    • https://cdn-cms.f-static.net/uploads/4366360/normal_601cc0c11f104.pdf
    • https://cdn-cms.f-static.net/uploads/4383572/normal_603d05b500576.pdf
    • https://static.s123-cdn-static.com/uploads/4415946/normal_5ffa9ab38798c.pdf
    • https://cdn-cms.f-static.net/uploads/4410976/normal_60518aa504c98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fobupojowojon/motorola_radio_headsets_wireless.pdf
    • https://s3.amazonaws.com/nefagolom/4480949139.pdf
    • https://s3.amazonaws.com/wujodibu/how_do_you_dilate_by_a_scale_factor_of_1_3.pdf
    • https://s3.amazonaws.com/setaxilitozuko/movie_counter_archives.pdf
    • https://s3.amazonaws.com/fobupojowojon/bevobetigibikubenevowiwim.pdf
    • https://s3.amazonaws.com/nitidadufetenu/blood_in_mouth_movie.pdf
    • https://s3.amazonaws.com/gizonukorad/baseball_uniforms_customize_online.pdf
    • https://s3.amazonaws.com/wifiduxezo/grey_sheet_food_plan.pdf
    • http://worurekebisur.rf.gd/shazam_app_for_nokia_asha_201.pdf
    • https://s3.amazonaws.com/getizar/report_phishing_scams_to_ftc.pdf
    • https://s3.amazonaws.com/befarekogol/curriculum_vitae_format_for_nurses.pdf
    • https://s3.amazonaws.com/fulazelof/81820966253.pdf
    • http://dogufisojorosef.epizy.com/88682150163.pdf
    • https://s3.amazonaws.com/geraromu/how_to_use_fluke_561_ir_thermometer.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_off0000ec20.bin
d28ae763598515b115de3c6c5624016c50c552ae6cbb75ee35bf8470b61d2397
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 5084 bytes
font_01_sfnt_off0000fd3b.bin
f599e12c1d0b8de1d733ce7f3c021e10e98db7bcfea4d69adaafad2ddd40d4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10828 bytes