Malicious PDF — malware analysis report

Static analysis result for SHA-256 af21a037ff8634ff…

MALICIOUS

PDF

74.8 KB Created: 2021-03-22 13:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4503745a4f169af4cd573153e2d298ab SHA-1: 748eee017bc3309c531262490eb0befc313671db SHA-256: af21a037ff8634ff35a7443973de9d349712153e070a3b4f68d7f0ebb2995ea5
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'crossword puzzle answers'. The primary malicious indicator is the embedded URL pointing to 'resalured.ru', which is likely used to host a phishing page or download further malware. No scripts were extracted, but the PDF structure itself facilitated the malicious URL delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/aws?utm_term=famous+pairs+crossword+puzzle+answers
    • http://vigirorimikana.medianewsonline.com/concepto_estudio_de_mercado.pdf
    • http://pamuxixa.iblogger.org/46772955571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0908c125-270d-4657-99ad-75c7482ad8ad/how_to_hard_reset_comcast_cable_box.pdf
    • http://jifadeve.rf.gd/application_inventory_list_template.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/wuwozotewalumotewa.pdf
    • https://uploads.strikinglycdn.com/files/e5a96d1b-e2cf-4d7d-99f1-504102d1b476/united_colors_of_benetton_hot_perfume_price_philippines.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_e72e5820f13e4a29ab437cbea4f42dcd.pdf?index=true
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_e7dc64a7655f48edb29e08f4f1f9d455.pdf?index=true
    • http://dowavatig.rf.gd/lifes_little_instruction_book_volume_1.pdf
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_d40a61610a134fc8ba1286968a1fec74.pdf?index=true
    • https://s3.amazonaws.com/papuja/8007547666.pdf
    • https://s3.amazonaws.com/bulalowisu/51321906588.pdf
    • http://valupakukav.myartsonline.com/ratojej.pdf
    • http://fowosirid.rf.gd/wogema.pdf
    • http://xamelolupete.epizy.com/how_he_loves_chords_in_g.pdf
    • https://uploads.strikinglycdn.com/files/3f76a4c4-388e-4a74-aef0-497f7f5b539b/44836684789.pdf
    • http://momesesewoja.rf.gd/12179932923.pdf
    • https://uploads.strikinglycdn.com/files/3c9e31c4-efda-462c-a24c-53f5cb527838/pilajexiwifexavutomita.pdf
    • http://bepolujogox.atwebpages.com/informe_de_auditoria_de_sistemas_de_informacion.pdf
    • https://s3.amazonaws.com/wikurixobelu/midpoint_and_segment_bisector_worksheet.pdf
    • https://s3.amazonaws.com/labitajaxatufib/cetol_srd_re_data_sheet.pdf
    • http://fepujivorer.epizy.com/81505148259.pdf
    • http://wodagewuxaver.rf.gd/nujemabesazelonowivem.pdf
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_0d0baa3431eb40b0bde94aed61a255b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/894e6a15-c774-410e-a891-d6f534c0b07e/kikazita.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_off0000e773.bin
c614c92652710d6e4013d39599c69f2b33230b90a7a3b3ec6fce09c6fea6484c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 5316 bytes
font_01_sfnt_off0000f98a.bin
875fff02ebc930d14d6981a930e203ea99444da960fa0468a91dfe6aca755bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 10452 bytes

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