Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ab0876d690386d…

MALICIOUS

PDF

119.7 KB Created: 2021-03-29 09:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 89cd3ace24c00ba4c93787b1db7990e7 SHA-1: 73cae189c23f22ab5fdea56ba6bbd5976808730b SHA-256: 23ab0876d690386dc71be01dead6f8ff3e06765b04846de90213f1426ba9dd12
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URL suggests a lure related to an 'award' and 'Australian history timeline pdf' to entice users to download the malicious content. The malformed stream length heuristic further supports the presence of exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://kuzutuzo.ru/award?keyword=australian+history+timeline+pdf PDF link annotation
    • http://paxabak.mypressonline.com/1998600357.pdfIn PDF document text
    • http://koparikamoze.scienceontheweb.net/40163545066.pdfIn PDF document text
    • https://cdn.sqhk.co/dirodivive/idgiomT/pixel_battle_royale_unblocked_games_77.pdfIn PDF document text
    • https://cdn.sqhk.co/sozasusu/dgdjhg2/soccer_player_dies_south_africa.pdfIn PDF document text
    • http://rimujitibux.mypressonline.com/febipikabeduzawa.pdfIn PDF document text
    • https://cdn.sqhk.co/bureruverog/jkgfijj/13323932392.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/jaigWzj/80755712417.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/73728306602.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/fyhd9jd/zotuga.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/arithmetic_sequence_worksheet_answers.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/gematelisusuwimixusowuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sifebitufol.onlinewebshop.net/getting_things_done_book_summary.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/5515603205.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/xexopivozopugidimof.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/bandaranaike_international_colombo_airport_live_flight_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de39bf6f-040d-4f3f-bd4e-9745cc64e30f/ashton_drake_reviews_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/nobixojesasawaramofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15825d10-2fee-49e8-803e-6a71668e3948/casio_sgw-1000-1aer_opiniones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b014a795-1a6b-404d-b775-d9171592f308/dutilazononeset.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/define_medical_term_bimanual_examination.pdfIn PDF document text
    • http://vumovofun.onlinewebshop.net/oxford_american_handbook_of_clinical_pharmacology.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/93318234189.pdfIn PDF document text
    • http://begujewirefe.myartsonline.com/diferencia_entre_cefalohematoma_y_caput_succedaneum.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_off000197a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197A8 5372 bytes
SHA-256: f511ca28c9192a295e902281baa4e8079f4a5a39bab77535c1cd79709e6541c6
font_01_sfnt_off0001a9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9CC 11696 bytes
SHA-256: f0dc6a6645c1042ea53f57b86983013b5a10403660a2db8f5891a71465ed546d

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