Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3e48bac51fc43e…

MALICIOUS

PDF

79.7 KB Created: 2021-05-04 09:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53bd79027065cb4e0b30cde3541ac9e6 SHA-1: 913f514b14e1a8e8979cafddcc0bda81729c3eff SHA-256: 5c3e48bac51fc43e950a2044401c089f76561c443bd66081c1798c1cded82cab
126 Risk Score

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 0.9967

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://jacksth.ru/strik?utm_term=fisher+price+swing+set+replacement+parts PDF link annotation
    • https://cdn.sqhk.co/gabironero/OijWhjU/strategy_games_free_pc.pdfIn PDF document text
    • http://lamawedetuburut.iblogger.org/anchoring_script_for_annual_function_of_school_in_english.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/canon_8800f_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372753/normal_5ff604218281f.pdfIn PDF document text
    • http://ihsteam.ru/kikorulutuwekgv0yv.pdfIn PDF document text
    • https://cdn.sqhk.co/mudixeguda/hheIigE/97405685446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_606d399e33777.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/74XdieJ/bowling_alleys_western_suburbs.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/6HQlxRR/lavawegalifobijijiwiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_603503c1d8413.pdfIn PDF document text
    • http://tertov.xyz/line_6_spider_jam_amp_modelsz3aju.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/vusaxedojofal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5feafa5a7a828.pdfIn PDF document text
    • http://legalvictory.group/223346150224ilax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_6066778388ccf.pdfIn PDF document text
    • http://golomashvanna.xyz/jack_reacher_2016_movie_download_in_hindi0jfh0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/bourne_ultimatum_song.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/50095002768.pdfIn PDF document text
    • http://nisanexurosil.rf.gd/xazidunanozosajesenegim.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/sawoxujubow.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/lincoln_210_mp_manual.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/joint_of_two_uniform_random_variables.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/believe_in_yourself_book_by_joseph_murphy.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/nadifajisakaborar.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/q-see_camera_compatibility.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/how_many_words_in_each_chapter_of_harry_potter.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_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 5396 bytes
SHA-256: fa1f37ac2cb0b38e5cbef244ecb7a8d66c23169f25eed691a41f75f19635c3aa
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 10492 bytes
SHA-256: 9fea5da998854eefcf33ddbce0f8eb9a86d9cfa0935833b5b2de8a78d39ba9d3