Malicious PDF — malware analysis report

Static analysis result for SHA-256 86833b0aa87d4df5…

MALICIOUS

PDF

75.4 KB Created: 2021-05-02 07:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19717bf19db2c42c68b2b2c96b28c4d SHA-1: 2ee141879b80ad4aa2aa3c1410d4b79157583d29 SHA-256: 86833b0aa87d4df538764d96c7a5474da26b45658b3bbb3f3548ca07deb7c655
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains an embedded URI pointing to a suspicious domain. The PDF structure and embedded content suggest it is designed to trick the user into visiting a malicious URL, likely for phishing or to download further malware. No scripts were extracted, but the presence of an external URI is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=lacrosse+shooting+drills+for+beginners
    • http://kevebofuru.medianewsonline.com/80192810338.pdf
    • http://vegifeda.mypressonline.com/biotecnologia_roja_aplicaciones.pdf
    • http://wediwutesifetuw.iblogger.org/63169352687.pdf
    • https://cdn-cms.f-static.net/uploads/4374024/normal_6018086724529.pdf
    • https://cdn-cms.f-static.net/uploads/4450243/normal_6049be5dc9558.pdf
    • https://cdn-cms.f-static.net/uploads/4425913/normal_60538b4c7c222.pdf
    • https://cdn-cms.f-static.net/uploads/4495265/normal_6047f119c6082.pdf
    • http://xomerisupudegop.medianewsonline.com/active_and_passive_voice_interrogative_sentences_exercise.pdf
    • http://kuliwajijet.22web.org/wapumirodoxijaxumekik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/56f81c81-b7e2-47cf-be19-42486f34c6c7/54338903103.pdf
    • http://dagepirobalov.epizy.com/auditoria_informatica_gonzalo_alonso_rivas.pdf
    • https://uploads.strikinglycdn.com/files/ad95be4a-b6ab-4de0-8d05-1f1270a1d20e/is_vicks_vaporizer_ok_for_babies.pdf
    • https://uploads.strikinglycdn.com/files/6d57767d-9769-49ed-bbae-22386dde60fc/mackie_cr4_price_in_pakistan.pdf
    • https://s3.amazonaws.com/penale/cyberpunk_2077_ps4_requirements.pdf
    • https://s3.amazonaws.com/pidufozu/zalozikagefebalunepusu.pdf
    • http://gulogomolu.rf.gd/save_bitmap_image_file_android.pdf
    • https://s3.amazonaws.com/faluzotixupi/73949567931.pdf
    • https://uploads.strikinglycdn.com/files/9ef118c0-2981-49a8-b125-dd0794f843ff/how_long_is_maxcare_warranty.pdf
    • https://s3.amazonaws.com/figidireki/descargar_apk_de_akinator_full.pdf
    • http://fajazimigig.atwebpages.com/zituratewetumoped.pdf
    • https://s3.amazonaws.com/dibedamoka/how_to_use_a_soap_dispenser.pdf
    • https://s3.amazonaws.com/satulibaren/stratified_probability_sampling.pdf
    • https://uploads.strikinglycdn.com/files/7f3e6aef-4584-489c-8e0a-e004d22ea349/kitchenaid_superba_oven_door_cleaning.pdf
    • https://s3.amazonaws.com/nowokil/gawimata.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_off0000e777.bin
67e26896fa316ec73247712f051ca63eb9f99793070e741ad304ecd3d3e6d086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 5364 bytes
font_01_sfnt_off0000f9ad.bin
b4893794173eb82bffc52c92b412454b9adf982a6d6947cd5bc54398f599bdbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10792 bytes

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