Malicious PDF — malware analysis report

Static analysis result for SHA-256 369198c3c8e1fa64…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 18:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4b772861ea3662bd6cb649ed06eb7e88 SHA-1: e54d5ed04e1119d2b21d337b2b3376b113bf00e3 SHA-256: 369198c3c8e1fa641b34763f646be3d6278bf179ef6665ef9b868c5ad57f152f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm for SEO manipulation. One of the primary links redirects to a known malicious domain. The document body, though partially corrupted, suggests a lure related to technical instructions, likely to trick users into clicking the malicious links. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+connect+my+honeywell+thermostat+to+a+new+router In PDF document text
    • https://static.s123-cdn-static.com/uploads/4370555/normal_5fff6e65c7a60.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/wekizafogakof_pipowofedukadaj.pdfIn PDF document text
    • http://dragonflysagewellness.com/choppa_name_meaning_in_urdueitwr.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/mekuzul_figusagomilowim_xuvuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493602/normal_60016d0f53fb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_5ff590b06ebb8.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/gokolejuwufodimuqhip.pdfIn PDF document text
    • http://hookup157.online/lafelajekarimunegowopulessfsz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474170/normal_5fd06433dd9f3.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/information_retrieval_vs_information_extractiony7v0m.pdfIn PDF document text
    • http://tells.fun/color_run_houston_march_2019kv2qh.pdfIn PDF document text
    • http://natlegend.space/alien_shooter_game_androidyzmlr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_600dbe42c9457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_5fd6c80282acb.pdfIn PDF document text
    • http://fruits-summer.fun/learn_python_scriptingx7hzy.pdfIn PDF document text
    • http://registrat.space/celulas_caliciformes_intestino_gruesoj4gda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5fcbb87f702eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5fde4a8295c53.pdfIn PDF document text
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/2542717.pdfIn PDF document text
    • http://frasqen.online/is_cellular_and_molecular_biology_hardzlbox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390995/normal_5fcf404642975.pdfIn PDF document text
    • http://trynon.xyz/fewogitafodio72ao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 5192 bytes
SHA-256: 56ca37580102ee0bf76342c679d38d7f138f4831274778a90294f083e2457c46
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 10556 bytes
SHA-256: 7a0711de7fb0e297b4b4bf85af0716ff084b099ab6c1199bff5fde42eafa91a4

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