Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18361bb9eef3ec3…

MALICIOUS

PDF

75.0 KB Created: 2021-03-13 16:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 017836686e00db6f98849b3c0b4580dc SHA-1: b1cfc6b4fb482f8ed8ecc18c03b45d9bcf1adafd SHA-256: c18361bb9eef3ec356fbce6dd6f330c8ac8b5763426fea7ebbe515a5299a97ff
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or malware distribution vector.

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 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://jumiwimov.ru/wix?keyword=avancemos+2+gramatica+a+answers PDF link annotation
    • https://cdn.sqhk.co/ripigopes/IhchhMH/rumevowumewowedumu.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/bernardo_guimares_o_seminarista.pdfIn PDF document text
    • http://noxerazomefo.iblogger.org/mavixopimutawanu.pdfIn PDF document text
    • https://cdn.sqhk.co/dudexobexine/jaBje7b/2070815840.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/hhjghgI/31418746728.pdfIn PDF document text
    • https://cdn.sqhk.co/kapipota/jipgjhd/tuzala.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/Cdcjhgh/strike_fortress_box_battle_royale_online.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/safety_glasses_over_prescription_lenses.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujimosodaza.myartsonline.com/art_history_volume_2_5th_edition_free.pdfIn PDF document text
    • http://zikefibuji.rf.gd/jumbled_sentences_quiz_with_answers.pdfIn PDF document text
    • http://jogatitow.epizy.com/is_powerade_zero_good_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/76918670699.pdfIn PDF document text
    • http://nubirumoxid.onlinewebshop.net/65411262282.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/air_core_transformer_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/up_b._el._ed_online_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/padodenalowawaluguzovovo.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/busaferedusirimemuw.pdfIn PDF document text
    • http://pikugire.epizy.com/bhumihar_matrimony.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/run_android_apps_on_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/posafalalil.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 5360 bytes
SHA-256: 0489b529866abb6f38f652304df15cf7db0f8aa8536e86756df54d91be48c9a5
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 11732 bytes
SHA-256: bd0b1b3eaab7f4ecc599aa93a2f636a53a832aa783afb69243a0a9ce60b798fa

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