Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16ba67af1a859f7…

MALICIOUS

PDF

75.3 KB Created: 2021-03-30 16:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48d8af970fc4156b735db3d05254934 SHA-1: edb93d22e253ed093fdc0e448bedb10c6614d871 SHA-256: c16ba67af1a859f7dcfe2de0c7cf58c51187d1f212b0627df140603482134671
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search query, likely intended to trick the user into visiting a malicious site. ClamAV and ML classifiers strongly indicate maliciousness, and the presence of multiple unknown URLs further supports this. The document body is heavily obfuscated, preventing a clear understanding of its specific payload, but the overall pattern suggests a phishing or credential harvesting attempt.

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://pelibifir.ru/wix?keyword=nucleus+definition+biology
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/9978240.pdf
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/bagike.pdf
    • http://xavanafaworinev.iblogger.org/castaway_cove_mod_apk_1._25._0.pdf
    • http://fazoluniguket.iblogger.org/34093154473.pdf
    • http://medicinfo.online/the_divisive_politics_of_slavery_worksheet_answers_keyvfoug.pdf
    • http://collegegraduatecentraldating.com/e_r_c_p_ka_full_formkva4p.pdf
    • http://4kuhd.me/23702328293bc3hc.pdf
    • http://medyahanem.com/the_lord_of_opium_free4uh60.pdf
    • http://zaralutodunuwa.66ghz.com/kundli_bhagya_video.pdf
    • http://artyom.guru/100_number_chart43xa1.pdf
    • http://trelon.fun/kitiwizhek9.pdf
    • http://biomanix.best/swot_analysis_journal_articlesbn7ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f845b56b-e747-4996-9d5e-3b9407a105b1/mufowit.pdf
    • https://uploads.strikinglycdn.com/files/44808111-e55b-4473-bf98-5048da62fba3/gather_round_homeschool_facebook.pdf
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_ed9fa4dde5574bd39b3084c6c9823fd0.pdf?index=true
    • http://sarirepenibe.epizy.com/3._nitro_to_word_online.pdf
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_dc63806037cf406e9de65851174e033f.pdf?index=true
    • http://zusobasiluwu.rf.gd/69468615465.pdf
    • https://uploads.strikinglycdn.com/files/7b59140d-fb84-47cf-8b18-64e9902ad59e/karcher_pressure_washer_pump_2400_psi.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_off0000ea38.bin
87f39df0a173745046b2ff7e035c09dbb2400abfaab65378520399b844eeeb04
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 5096 bytes
font_01_sfnt_off0000fbb4.bin
09259f6edbeeadaacd56033e59bcaefb5ff821def4dbd75619c3f4c279bdb599
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 10672 bytes