Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f733ec83ae56e89…

MALICIOUS

PDF

79.8 KB Created: 2021-05-06 11:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6bf1fa5ad42acf04d06c643be7199141 SHA-1: e7017cbc0aef5f441e7cb9ba8b20c70c2e521372 SHA-256: 1f733ec83ae56e897a3388aa75bbc174d2f6bb5c67312b7a19cd30647537f075
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that serves as a lure to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=why+is+my+coffee+maker+brewing+slow PDF link annotation
    • http://zotonurapad.22web.org/ara_ra_ra_marathi_song_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/hguFhiP/kanto_yu6_vs_audioengine_a5.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/mgghbWl/pimetafepirejukukelasaxot.pdfIn PDF document text
    • http://uspex22.online/91313105083lqmro.pdfIn PDF document text
    • http://bapexuwepurisig.22web.org/chest_af_guidelines_2018.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/65563844734.pdfIn PDF document text
    • https://cdn.sqhk.co/nolugavetiri/iggPEbg/zumasuraxe.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/76775831878.pdfIn PDF document text
    • http://sibiwuketilivi.22web.org/redike.pdfIn PDF document text
    • http://doordash.fun/formal_letter_asking_for_moneysrheo.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/50719518758.pdfIn PDF document text
    • http://unlockdeals.shop/cateye_micro_wireless_manual_danskyfj5h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://durenifujogax.myartsonline.com/ribosomas_procariotas.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/what_am_i_riddle_answers_46.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/1001_arabian_nights_2000_full_movie.pdfIn PDF document text
    • http://puribobelumisi.rf.gd/navodaya_online_application_form.pdfIn PDF document text
    • http://mamepekavileput.rf.gd/how_to_crochet_very_easy_baby_blanket.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/favikosajumakitegapupol.pdfIn PDF document text
    • http://dawutanarav.epizy.com/52026656135.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_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 5704 bytes
SHA-256: f916cbc7e44121f63e670171313b6d8f3df1e94b1f95fc973d3c917a14834970
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 10736 bytes
SHA-256: ca29be672635d4c5c88b7c193e851a9de2c821c271e1d832a990291ed4e579e2

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