Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cef1d01db44d812…

MALICIOUS

PDF

78.4 KB Created: 2021-02-26 19:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ddb2fe8c8dc4aa78ce5fb7acd7519ba9 SHA-1: 2400373b5dede7accad9e9faafcf88bd0c25caf3 SHA-256: 7cef1d01db44d81203dc3d67480cdd759e07b8129bbe7a713f19edb39d32368e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/strik?utm_term=wheel+of+time+cast+aviendha PDF link annotation
    • http://dewobazul.22web.org/22526600317.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/lakoxubifikibunujatimerin.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/camp_chef_pellet_grill_cover.pdfIn PDF document text
    • http://dobikan.22web.org/rumex.pdfIn PDF document text
    • http://guwejino.iblogger.org/35343349695.pdfIn PDF document text
    • http://lisipezasuk.iblogger.org/convert_adobe_file_to_word_document.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumidexasij.epizy.com/adam_and_eve_by_kinaata_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/palagufixixevosadez.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/burrito_bison_mod_apk_2._83.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/ccc_information_services_salary.pdfIn PDF document text
    • http://segixiw.epizy.com/82661940439.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/how_do_i_connect_hp_deskjet_printer_to_wireless.pdfIn PDF document text
    • http://pajuzipoxebemo.rf.gd/sobopilavaparutemiwixaka.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/91629301791.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/android_mobile_tracking_using_gmail.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/lerupugagebapipisuz.pdfIn PDF document text
    • http://papilumovojulez.epizy.com/snet_email_settings_android.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/nokubaxobigomubejawevikaf.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_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 5236 bytes
SHA-256: fa5f74377a6232d2099744f52a2b8aa41a8b1b77f7b0f52925f19e2e03e7a4f0
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 10860 bytes
SHA-256: 5645ff5223e9051a10cc9f5de5e7fbe78ba42221dba31a4ae263b888632cae69

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