Malicious PDF — malware analysis report

Static analysis result for SHA-256 c142155ee96bd3c6…

MALICIOUS

PDF

80.1 KB Created: 2021-05-09 14:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 171202d83fa8dfc9f183f8c6aa254f87 SHA-1: a9056d53011ce6fdbbd6986c27cef3f68bf9e78c SHA-256: c142155ee96bd3c63e4edf9749b9391c161ac40f3a5bd1ecb544693b408c796b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'nipisod.ru', suggests the document is designed to redirect users to potentially harmful websites. ClamAV also detected it as Pdf.Phishing.Trojan.

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 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://nipisod.ru/strik?utm_term=hern%25C3%25A1ndez+fern%25C3%25A1ndez+y+baptista+%25282010%2529+metodolog%25C3%25ADa+de+la+investigaci%25C3%25B3n PDF link annotation
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/60803037c1.pdfIn PDF document text
    • http://padakogako.iblogger.org/xirelivigovuma.pdfIn PDF document text
    • https://guxolufesa.weebly.com/uploads/1/3/4/4/134468064/toxakup.pdfIn PDF document text
    • https://cdn.sqhk.co/govibabika/ejjHk8G/gasibikene.pdfIn PDF document text
    • http://vukefof.22web.org/96300229860.pdfIn PDF document text
    • http://noxokolozoj.iblogger.org/tattoo_on_my_shoulder_song.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/finJ1nw/tiktok_songs_october_2020_with_names.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wemitagokodunes.epizy.com/39252582121.pdfIn PDF document text
    • http://ditajizuru.rf.gd/antifungal_drugs.pdfIn PDF document text
    • http://wumipuxupixak.epizy.com/how_to_calculate_prevailing_wage_in_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/95379791981.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/jivenarokoweweratut.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/ca_real_id_application_form_online.pdfIn PDF document text
    • http://figelaziri.epizy.com/asvab_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/webex_room_kit_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/power_outage_report_oncor.pdfIn PDF document text
    • http://lorenivi.rf.gd/1177338501.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/nopuzelegulewuderisorufot.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_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 6692 bytes
SHA-256: 1228344a9a10490fc0064e4bfa007aef460d176f7669c624310f18a4c0e3771e
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 11652 bytes
SHA-256: df19bc986708e242d0f9828c40619007d731e280d4a831ede43a948803193877

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