Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac73f6bde8276037…

MALICIOUS

PDF

74.9 KB Created: 2021-04-07 14:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bf77c5ff3dc4350efe4836d928c4e719 SHA-1: e5db704c7bbf3097dcf1ea6cda6330d39da473a4 SHA-256: ac73f6bde8276037304b8129e5704a770915a36bec7abc8c8bd83d169aee44d2
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 URL that directs users to a suspicious domain, likely to host a phishing page or download further malware. The document body, though heavily obfuscated, appears to contain search query text, suggesting a social engineering lure.

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://dugedepap.ru/strik?utm_term=how+long+do+you+cook+frozen+chicken+tenderloins+in+a+crock+pot PDF link annotation
    • http://nurokojo.mypressonline.com/can_fire_and_ice_condoms_give_you_a_uti.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/28702959834.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/furosemida_efectos_secundarios.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/87951975154.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/classical_fourier_analysis_loukas_grafakos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/4664429128.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/70370595886.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/jebuzutamepuminive.pdfIn PDF document text
    • http://duribolatajofa.atwebpages.com/risk_assessment_procedure_audit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e71b33-30f8-40f8-840e-bec2c040e7bb/how_to_write_an_autopsy_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09ef23f-bc00-44b5-bc15-5b05e95309a4/evenflo_advanced_chase_lx_harness_booster_seat_dotty_flamingo.pdfIn PDF document text
    • http://vowojuxibaxo.myartsonline.com/80216018007.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/58380531735.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/mi_amigo_jesus_acordes_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902d16e8-f07a-41e4-8cb9-323ff34fb97e/4202250300.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/75111859586.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 5688 bytes
SHA-256: 7610d72301a9f566a6da68d321f1c11eb344dbea10260a6923be504d4a3c71ad
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 10700 bytes
SHA-256: 80b3d8b4ef3f68804d0935b89608846aa54d366b032600ab02adeda29fb6e8f3

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