Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d755c9e5784208…

MALICIOUS

PDF

69.2 KB Created: 2021-04-01 10:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb2bed97e3be7dd2fbc8b0df951ff465 SHA-1: 9be85883741d6847c5790377c9c90dd54e5e77d6 SHA-256: 49d755c9e57842088ba4f3043bf8d0c3896c586459337cc9b6fbdadeb8e4b3e0
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 0.9998

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://kuzutuzo.ru/award?keyword=gelman+carlin+stern+and+rubin+bayesian+data+analysis+pdf PDF link annotation
    • http://rcasino.info/bts_love_yourself_answer_album_all_songs8hx17.pdfIn PDF document text
    • http://pek-24.cc/74354398658uw1pm.pdfIn PDF document text
    • http://fruit-ital.space/adding_and_subtracting_fractions_with_unlike_denominators_and_whole_numbers_calculator678n8.pdfIn PDF document text
    • https://beteviduzil.weebly.com/uploads/1/3/3/9/133986260/mixenisekeputad_kifudazu.pdfIn PDF document text
    • http://pornbustyvids.com/zasimadosavuzaln643j.pdfIn PDF document text
    • http://verifiedbadges-form.com/how_do_i_start_a_new_paragraph_in_exceljdwq4.pdfIn PDF document text
    • http://topcreditreport.info/brought_out_to_show_informally_crosswordv6xcl.pdfIn PDF document text
    • http://metazoaapc.fun/xufijufiwegaxomesuwugem1vrm9.pdfIn PDF document text
    • https://kowasazupajobex.weebly.com/uploads/1/3/1/3/131383373/wupotupel_lokesi_gefamurikubis.pdfIn PDF document text
    • http://flebolog24.com/how_to_start_playing_tennise7gse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_9a0becda68cc420c94e0cb42acb34f32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7918db8a-0b61-4b59-9af5-8261a15937d4/61333227174.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/votanisosapegelajugages.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_35485a14a7134670ac8428148713488c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/isn_t_she_lovely_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad765c5-cad0-4c80-8164-51eee6228cb6/lasujotarotuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abb6c48-5f40-4916-b8c6-f6dfab34a305/tokinugapexoxuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ff1481-e3f9-4b36-a185-6dc7bfaa1714/how_to_connect_to_parrot_ck3100.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/health_and_safety_diploma_courses_in_uae.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_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 5572 bytes
SHA-256: d69745c751e79f8808eb0762e5ddc043f64b05f88a1b282ecd99d96e655ff251
font_01_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 10012 bytes
SHA-256: 0f703933c68342b4953aa16841abdc641078bf0e7f5e5cd92cc8e987fc669412

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