Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4779ef171ba4392…

MALICIOUS

PDF

75.9 KB Created: 2021-05-07 23:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cab150ff173d0ce183d105c47bd797dd SHA-1: 2af28c32f1ee9d3cc4dc4cb2c197251686592069 SHA-256: c4779ef171ba4392fd86dde27b02e9f6862b169068bb1440ab107a8237a7ae87
116 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically for phishing and trojan activity. The document body, though partially obfuscated, contains text related to 'ebt on walmart grocery app' and the heuristic 'SE_CALLBACK_LURE' indicates a callback phishing or tech-support scam pattern. An external URI, https://ponafet.ru/strik, was also extracted, likely serving as part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ponafet.ru/strik?utm_term=how+to+use+ebt+on+walmart+grocery+app
    • http://psychologyrelax.xyz/konozlsf94.pdf
    • http://study-english-05.site/les_trois_mousquetaires_alexandre_dumas_texte_abrg_resumej2367.pdf
    • https://cdn-cms.f-static.net/uploads/4366003/normal_60585e7b6c1a0.pdf
    • http://zitarekatinupas.sportsontheweb.net/fusionner_plusieurs_fichiers_avec_foxit_reader.pdf
    • http://nomenowunesazoz.scienceontheweb.net/lecturas_domingo_xix_tiempo_ordinario_ciclo_c.pdf
    • https://cdn-cms.f-static.net/uploads/4411714/normal_606c9bcf2be6a.pdf
    • https://cdn-cms.f-static.net/uploads/4485446/normal_603e8c1edc725.pdf
    • http://lenuvivureropi.scienceontheweb.net/wimapidesebawebawomifosod.pdf
    • http://help-ruleviolation.com/bose_av3-2-1_ii_media_center_remote_controluf9el.pdf
    • https://cdn-cms.f-static.net/uploads/4446773/normal_6047223c8063d.pdf
    • http://gokawojop.scienceontheweb.net/juwutujusevaxajexeseton.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tapelu/ffxii_bahamut_guide.pdf
    • https://s3.amazonaws.com/satuja/rulutuwiropunomogetuso.pdf
    • https://s3.amazonaws.com/jotogorurekuro/hp_laserjet_pro_400_color_m451nw_driver_for_windows_10.pdf
    • https://s3.amazonaws.com/wozowuledij/6161074149.pdf
    • https://s3.amazonaws.com/norozovijalu/60109234319.pdf
    • https://s3.amazonaws.com/forupokisip/how_to_read_a_tarot.pdf
    • https://s3.amazonaws.com/kuxuxemu/pantheon_guide_rework.pdf
    • https://s3.amazonaws.com/zarelusipofox/temple_run_brave_apk_uptodown.pdf
    • https://s3.amazonaws.com/wurivuve/one_dimensional_wave_equation_problems.pdf
    • https://s3.amazonaws.com/savifin/57414206076.pdf
    • https://s3.amazonaws.com/kelukakeb/jeffrey_archer_nothing_ventured.pdf
    • https://s3.amazonaws.com/womirofop/10_envelope_template_free.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_off0000eb53.bin
18d488ba73871782ebf71536cabcbe49de7628127856e71a33c62119e3f79893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 5548 bytes
font_01_sfnt_off0000fe33.bin
5bacebe359e766a6504cb74c3de5e5d1ab5f094cfc8fe20cfbf13d851b0b487b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 10408 bytes

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