Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6c3cd8f72ac1dd…

MALICIOUS

PDF

83.9 KB Created: 2021-03-23 23:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5e833ddb257c1fa28a17534290ef6dc0 SHA-1: 9cb3184fbe5e0d586412feea351c9dde784705ba SHA-256: 1f6c3cd8f72ac1dda4c3f060da4e02434a925a672ab8d52687b27496200d37a3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/123?utm_term=aiff+format+sound PDF link annotation
    • https://waratonis.weebly.com/uploads/1/3/4/2/134235653/7d5760269.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/download_hallelujah_chorus_tonic_solfa.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/11605016653.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/ijiaXsr/puvozupoguluji.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/nopiwajegonelovoruxeb.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/1jemjg7/guregapizofif.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/ifjjxr0/tuvusiraxologixudovago.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/lameruwopojegejapiper.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/kasemimedisumosonugi.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/jegcXjg/photo_mask_editing_apps.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/839bc.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/flight_of_the_bumblebee_alto_sax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac17265c-3edf-4853-9293-35da4f804126/constitucion_politica_mexicana_art_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b3e58a-50f4-490c-8e23-97b90110a659/the_tempest_act_1_2_3_summary.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/palmistry_in_urdu_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/classic_wow_guide_shaman.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/anonymous_and_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a716d4-4d27-4135-9522-6f8cd68c0bf6/83783139366.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/angry_neighbor_apk_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/pgcet_2019_answer_key_mtech.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/49136685072.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/pagijiroj.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_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 5012 bytes
SHA-256: d4ef7427e8bf86f4c95c048e9ff32c6a20b08b670ddc0e1e74e20d5a628aa95c
font_01_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 11748 bytes
SHA-256: 26633ab8af5c954784c5f08ea3136ed531ddde10ac2fbc48bf2654ca32e6d868

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