Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f64e8561665318…

MALICIOUS

PDF

84.1 KB Created: 2021-03-29 17:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: abfa4bb3ef61b853ea3d1d491caa2eb0 SHA-1: 80ecda94afc0997f561389da7cc57730b19a0695 SHA-256: 18f64e8561665318b1b3799da802b5c5496e7372ab4cdc8a58514c56093a97f0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents, but one primary URL is identified as malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The embedded content, though heavily obfuscated, suggests the file's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/123?utm_term=charles+baudelaire+albatros+pdf PDF link annotation
    • https://jigudeganulufis.weebly.com/uploads/1/3/6/0/136054519/jimosopu.pdfIn PDF document text
    • https://tijaworiluwulu.weebly.com/uploads/1/3/4/3/134363233/4804024.pdfIn PDF document text
    • https://wozibamerixe.weebly.com/uploads/1/3/4/6/134695723/c890c8d.pdfIn PDF document text
    • https://rovividupezudu.weebly.com/uploads/1/3/4/3/134373795/xozub-nosiwelosodefem-fajukekowinoj-benavajasod.pdfIn PDF document text
    • http://puzofogerexiwi.22web.org/76365704320.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/950282.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/gedexim/amcor_portable_air_conditioner_not_cooling.pdfIn PDF document text
    • http://dorufuta.epizy.com/sajaxosura.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/fdmc8884_mosfet_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/4_types_of_sensory_input.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/94_answers_synonym_for_nerd.pdfIn PDF document text
    • http://lesizemub.epizy.com/whatsapp_for_pc_window_7_ultimate.pdfIn PDF document text
    • http://tixinova.rf.gd/experienced_interview_questions_and_answers_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/shawn_mendes_holding_me_back_song.pdfIn PDF document text
    • http://tiguvazigavis.epizy.com/89533604618.pdfIn PDF document text
    • http://bopetupuvito.rf.gd/825016559.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/cardo_scala_rider_g9_update.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/b_o_c_new_music.pdfIn PDF document text
    • http://simanij.rf.gd/agamben_the_time_that_remains.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/19067171728.pdfIn PDF document text
    • http://safefake.epizy.com/graphite_powder_and_properties.pdfIn PDF document text
    • http://rananutoto.epizy.com/carly_bmw_pro_android_apk.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_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 5176 bytes
SHA-256: 411e916e2fe42f4300b0751b5e5bd590445ff5897d980fa13fdbfdeb1b799247
font_01_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 22912 bytes
SHA-256: 40e929692ecba9c974d0b12c591b5c1011985dee30007a428fde68a35a999e12

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