Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c4bfe6b1bd8faa…

MALICIOUS

PDF

77.1 KB Created: 2021-03-31 17:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dd136689b9790e24c8e7d0f0420d4d66 SHA-1: 570713ba0954c9e9b3aab7b0110b4501764bf090 SHA-256: 86c4bfe6b1bd8faae9815328a8b23372bd79e663e1f8f68ac63725bc22b96be7
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=3.5+prestige+classes+druid PDF link annotation
    • https://zanemuwezujapab.weebly.com/uploads/1/3/4/7/134765617/1791671.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/vce_to_converter_online_version_v7._1_free.pdfIn PDF document text
    • http://storeyou.store/little_house_on_the_prairie_season_10ybxho.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/sefejavogaki.pdfIn PDF document text
    • http://bilkaita.space/vusozekerezevoboptd3oj.pdfIn PDF document text
    • http://eeeeeyyy.space/82721370184h4fns.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/1_metro_cuantos_centimetros_son.pdfIn PDF document text
    • https://winuvuvivadasuj.weebly.com/uploads/1/3/4/4/134480566/risej.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/tesla_model_3_price_uk_used.pdfIn PDF document text
    • http://nukatisorifi.iblogger.org/zananimo.pdfIn PDF document text
    • http://myfirstsite.xyz/what_is_submissive_meaning_in_tamil_peacerz4j9.pdfIn PDF document text
    • http://zekabor.iblogger.org/all_right_now_tab.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/pearson_biology_source_11_textbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_c20cc2f2648346dca10c11407dcf76ef.pdf?index=trueIn PDF document text
    • http://juwikoramet.rf.gd/two_phase_method_linear_programming_calculator.pdfIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_8241ba7c577f48a4aadf69c9f725a35e.pdf?index=trueIn PDF document text
    • http://wiwowefitupek.epizy.com/how_to_get_rosetta_stone_through_walmart.pdfIn PDF document text
    • http://nofuvexozupura.epizy.com/1930113985.pdfIn PDF document text
    • http://fibejebovef.epizy.com/6437421751.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_4b4e136391ed4c3badc17be567ba1351.pdf?index=trueIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_38f3cf6854834739a65b8c76ea2c777e.pdf?index=trueIn PDF document text
    • http://xidiredojowezi.epizy.com/reformar_casa_antigua_precio_metro_cuadrado.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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 5468 bytes
SHA-256: 6c0dcdb3de4c32faf7b1e540f35caf580a908445b1706955deb796d7b718304e
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 11412 bytes
SHA-256: daf669a5a5542528b66ab5906aa7f38c8fdd857bb88aec77363b2991189a37de

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