Malicious PDF — malware analysis report

Static analysis result for SHA-256 53baf500407795a4…

MALICIOUS

PDF

72.6 KB Created: 2021-06-09 17:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b502dc43b5fb12a6a5c16947e1ad23a6 SHA-1: bdc76c22e88778180b8c9e18f9cf80afa3817d0f SHA-256: 53baf500407795a487adae274b49885a0f2a6a7a9612143ffc03d15f22132819
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 0.9997

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://archism.ru/pbw?utm_term=the+last+leaf+multiple+choice+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412378/normal_602b3935bfc94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_6041ce7b13719.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/26f36b8837e8b32.pdfIn PDF document text
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/7673744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5fff7e3f152ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fisagibop.pbworks.com/f/32561416914.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/valor_absoluto_y_valor_relativo_ejercicios.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/8.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/pcos_indian_diet_plan_to_get_pregnant_in_hindi.pdfIn PDF document text
    • http://legalugo.pbworks.com/f/pajebikebujin.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/f/the_secret_life_of_walter_mitty_soundtrack_song_list.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144586398/tum_se_achcha_kaun_hai_movie_mp3_songs_free_download.pdfIn PDF document text
    • http://gosavepifij.pbworks.com/w/file/fetch/144743871/marriage_biodata_format_for_girl_doc_free_download.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/f/67872892551.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144474906/21875932395.pdfIn PDF document text
    • http://punumiboxo.pbworks.com/f/dajipulubowugipugumis.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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 5232 bytes
SHA-256: a583fc4b5045bdc206b532eaf569d04dd57b1ddbab8907d3b1f3ca64dcc5beeb
font_01_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 10592 bytes
SHA-256: 6cd6956694be8382230da23cf619efcd892cf39ce92e8ce08dafa8f82ce279f2