Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e23c03e744a9a5b…

MALICIOUS

PDF

74.5 KB Created: 2021-03-25 09:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0879e00e5e463d02793f082dfde799c SHA-1: 78d23ffcbdf0014fed85db74f170c0f8c91f6f7d SHA-256: 6e23c03e744a9a5b91e8f1d5dd79c81049ec8009375e19e9355c836bad075d23
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://pelibifir.ru/wix?keyword=show+listening+ports+windows', which is likely a lure to direct the user to a malicious site. The document body, though heavily obfuscated, contains text related to wkhtmltopdf and technical terms, suggesting a technical pretext for the malicious link.

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://pelibifir.ru/wix?keyword=show+listening+ports+windows
    • http://resimpub.com/alegoria_de_la_caverna_de_platonwfmue.pdf
    • https://cdn.sqhk.co/gupuwiwi/ewgew6b/34831215802.pdf
    • https://cdn.sqhk.co/nubokeso/vRhhMjc/earthing_bed_sheets_canada.pdf
    • http://fosireditoj.mygamesonline.org/que_se_puede_comer_cuando_se_sufre_de_reflujo.pdf
    • https://cdn.sqhk.co/safubuguva/AigjEUN/download_game_drake_n_trap_mod_apk.pdf
    • http://tekeriset.iblogger.org/ejercicios_matematica_financiera_interes_simple_fecha_focal.pdf
    • http://zokazurimila.mygamesonline.org/sociologia_da_educao.pdf
    • https://cdn.sqhk.co/kekelivig/gfLotQ0/hand_drill_for_resin.pdf
    • https://cdn.sqhk.co/tusenepobam/9haTKyi/38251621260.pdf
    • http://ig-copyrightviolation.com/utilitech_sump_pump_1_6hplvksu.pdf
    • http://bosemefawixuwov.mypressonline.com/letijapulo.pdf
    • http://copyrightviolationcenters.com/calculator_app_for_android_githubvhfjy.pdf
    • https://cdn.sqhk.co/foseziwate/Ijfhfhh/54122957635.pdf
    • http://fherixq.com/18575204566wjyeo.pdf
    • http://lorewipa.scienceontheweb.net/the_martian_movie_download_in_hindi_hd_720p.pdf
    • http://salukapebuke.iblogger.org/28268586173.pdf
    • http://sarilaruzez.iblogger.org/movie_based_on_a_prayer_for_owen_meany.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://newumil.epizy.com/73931580834.pdf
    • http://poduzamilikuki.rf.gd/68732178119.pdf
    • http://merovuditipin.onlinewebshop.net/sewage_treatment.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_off0000e2dd.bin
3524572413996879d5528bd904d16f10b82641809f401cb12842d62973411cd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 5208 bytes
font_01_sfnt_off0000f49d.bin
14738547d5f1d5d6e9c6f90fa55ad7cad6a56d4ae42894a65d73519631fe8e94
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 12048 bytes