Malicious PDF — malware analysis report

Static analysis result for SHA-256 4107b898bceee114…

MALICIOUS

PDF

81.1 KB Created: 2021-03-10 10:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5e905e9990a43ef272f533caf415cf SHA-1: 5dd8f2deea00e3474dc7b9938371adc681de851e SHA-256: 4107b898bceee1149f94827ba8ab2bee2c4ca41f6d4d8c305d19017ba0f6a6d1
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, pelibifir.ru, which is likely used to host a phishing page or a second-stage payload. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=resumo+de+analise+combinatoria+pdf
    • http://reduslimitaly-ufficiale.site/yellow_snapchat_appx087x.pdf
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/4181977.pdf
    • https://cdn.sqhk.co/fipufose/cHidxfK/zivarufagebebazonegabal.pdf
    • http://prizinsta365.site/75803047570aez46.pdf
    • https://cdn.sqhk.co/gawukale/gdvhjjb/pabodalaravuba.pdf
    • http://myfoxing.online/petavapeluv5z7x.pdf
    • http://fullstacket.online/download_microsoft_project_2019_for_maceasxf.pdf
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/9037304.pdf
    • http://gogotmif.space/clinical_pharmacology_and_therapeutics_bookbkkl1.pdf
    • http://phulop.store/sesubikidewuluxokutusijot6wt2.pdf
    • https://movabeze.weebly.com/uploads/1/3/0/8/130814110/646aa.pdf
    • https://cdn.sqhk.co/lubometusoz/Ajin9he/carpet_cleaner_solution_walmart_canada.pdf
    • http://regivag.iblogger.org/diablo_2_horadric_cube_rune_upgrades.pdf
    • http://lnstagram-verifedbadge.com/half_yearly_exam_2018_english_answer_keyk6u09.pdf
    • http://instapriz24.site/what_does_the_quran_say_about_punishment_in_the_gravemjfir.pdf
    • https://cdn.sqhk.co/vakolitakap/dtyjajj/cotton_classing_hvi.pdf
    • https://lolovegadagofi.weebly.com/uploads/1/3/1/6/131636941/3b6d90f298.pdf
    • https://juloxiwam.weebly.com/uploads/1/3/5/9/135967800/gafojexib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mijikabetabup.rf.gd/gemafiganobuwopevijigadi.pdf
    • http://rudufegasavu.rf.gd/brics_full_form_in_english.pdf
    • http://rivadejupogutun.epizy.com/sparkfun_load_cell_amplifier_datasheet.pdf
    • http://zexitan.rf.gd/bhojpuri_song_2019_dj_tinyjuke.pdf
    • https://s3.amazonaws.com/kiguteperilodu/68412931081.pdf
    • https://s3.amazonaws.com/nijudow/70767288505.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_off000100ae.bin
e192a7e812f7431eb3a82442a9fdb4ccac144a2a86f09a63f7cd904d3eaebba6
pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 5448 bytes
font_01_sfnt_off00011315.bin
f5d7e6f692413755c10d559c2bce46d46e86f0848a090ef95d4e540c369c683d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 10440 bytes