Malicious PDF — malware analysis report

Static analysis result for SHA-256 545f84e86ec85d0e…

MALICIOUS

PDF

99.9 KB Created: 2021-04-05 01:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4348d26b4c32fb62b208cbc06d0e5ad0 SHA-1: 203bfe9e4fa4969387628fcd35fe71251d71a2de SHA-256: 545f84e86ec85d0e2a8d1405172a1d029d576d44ad8ce80e1bae6279b1ee7644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one prominent example being 'http://xebepadizupen.22web.org/how_to_fix_a_tappan_gas_oven.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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 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.
  • 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://baarspo.ru/award?keyword=christmas+carol+by+charles+dickens+pdf+free+download PDF link annotation
    • http://xebepadizupen.22web.org/how_to_fix_a_tappan_gas_oven.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/jedana.pdfIn PDF document text
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/cba2053cc258d.pdfIn PDF document text
    • https://jawuzinirofona.weebly.com/uploads/1/3/4/8/134886132/togeguzozivifokitev.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/futamo/how_to_program_honeywell_rth2300.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/lowezeforuxenego.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/insurgency_sandstorm_weapons_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/virtual_el_libro_vaquero_y_similares.pdfIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_f1e41576fbf94d8eb87124ffd71061b6.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_72af30c917754327a7b023e122dfe66b.pdf?index=trueIn PDF document text
    • http://lekanewome.epizy.com/characteristics_of_descriptive_research_design.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_2b66986a473046acb345bf20bcb93d38.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_29469d95e7de456fbf5806c7c0014653.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/zosaza.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/stihl_bg86c-e_27.2cc_petrol_leaf_blower_ergostart.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/dezepuxufu.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/wixubodetugipobow.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/48586423303.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_8e367e5499d34729bc3a4948d00edf43.pdf?index=trueIn 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_off00013a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7A 5696 bytes
SHA-256: 1b83bbeda5464f30d14e67ad7f8f8c4bdaf9abc626599585a2cc4fb043eeeea0
font_01_sfnt_off00014dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBF 18040 bytes
SHA-256: 1e6916466946fa9538738b7fbc3f2d6d0e7db11cb324d20b62f27d96263e121f

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