Malicious PDF — malware analysis report

Static analysis result for SHA-256 b887175a83b71196…

MALICIOUS

PDF

82.1 KB Created: 2021-03-16 02:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f4b4e14d4f13a46e05e7b3741a10575 SHA-1: d07ad95130f865c6e5d2b20ad1bd83e94356fda9 SHA-256: b887175a83b71196844c65d78c573dd0e7635a30252c7c41d5c8780271124a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=king+of+fighters+xiii+android+apk
    • https://poburazaz.weebly.com/uploads/1/3/5/9/135993358/wepogopekoreruxow.pdf
    • http://badge-verification-center.com/72258684143dp4n9.pdf
    • http://jovedarike.iblogger.org/graphing_linear_equations_worksheet_math_drills.pdf
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/4052052.pdf
    • http://avtovishki-msk.ru/ruwegilovokajek6vee.pdf
    • http://povulofi.mywebcommunity.org/metodologia_de_la_investigacion_cientifica_hernandez_sampieri.pdf
    • https://fekalebewobazo.weebly.com/uploads/1/3/4/6/134668576/4065720.pdf
    • http://aycotoro0.xyz/atm_transaction_failed_complaint_letter_format_sbihreuf.pdf
    • http://nosumiva.mywebcommunity.org/zirubotowupupajafasixa.pdf
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/sazakimuwebuvu.pdf
    • https://dinorega.weebly.com/uploads/1/3/3/9/133999175/loterakagopopog_rapebatosig.pdf
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/dugojonopenugit_natoxisele.pdf
    • http://ita-talia.fun/jivexomutinomoxpb30h.pdf
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/12475.pdf
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/nerajenopema_gufat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lupuvogotog/45472881235.pdf
    • https://s3.amazonaws.com/wetowuzuxit/what_does_data_warehousing_allow_organizations_to_achieve_brainly.pdf
    • https://s3.amazonaws.com/daraniwekamidir/lawofukefofogumore.pdf
    • http://gupepitasaxisal.epizy.com/keparixaxojaripujimotix.pdf
    • http://vexabimumemig.atwebpages.com/how_to_write_out_a_dd_campaign.pdf
    • http://warevaxuderisi.rf.gd/97041709465.pdf
    • http://difedomuki.epizy.com/6887713288.pdf
    • http://xirofapinowud.atwebpages.com/796740522.pdf
    • http://vawamunasujefu.rf.gd/pdf_file_splitter_free.pdf
    • http://fegoluvarelewum.myartsonline.com/pakatan_harapan_manifesto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed08.bin
fb6d8eba70e1c8b52ddb42bab8debe35eb12702c1aa379857b84e45c1fd4da8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 5372 bytes
font_01_sfnt_off0000ff57.bin
fb967b72115c0e0796be8e3c7edbbf294e8d6e875330a2865e96a3c4df423044		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 11696 bytes
font_02_sfnt_off000125d8.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 16060 bytes

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