Malicious PDF — malware analysis report

Static analysis result for SHA-256 328c602c427b891a…

MALICIOUS

PDF

114.4 KB Created: 2021-03-16 18:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a4ceca97d870a8fddeb709d579a93b5c SHA-1: 0f1be6c82e0c5ce30e2277fb142557f559184760 SHA-256: 328c602c427b891a423b912eecd3cc304334dbbc715317d6f1c1c0b574b662a0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF documents, suggesting a potential phishing or SEO manipulation scheme. The presence of multiple external links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://maypoin.ru/wix?keyword=ti+84+plus+silver+edition+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481993/normal_5fdb89e56ac4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5ff674cc7d12e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470830/normal_5ff7574fdc89d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_6031074598839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5ffdb8b274b0e.pdfIn PDF document text
    • http://businessoutsourcing.org/the_answer_garden_products_abbotsfordukacn.pdfIn PDF document text
    • http://afracheat6.xyz/subepivopefomixeri8wacp.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_9fdeae0885a94d38acb38f367389999f.pdf?index=trueIn PDF document text
    • https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_83120cafa001457398dc95ee97234459.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_47e54ffd7bff421691a5db1fedc4ed0e.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_04075fea59db40d2b76f49781f6b0bd7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/basics_of_civil_engineering_drawing.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_b1192c76259b484eb2f913efa24b5740.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/41430686338.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_852eaf6cd910463f98b230fde3f84a1d.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_382b3231e551433488165d965fec0355.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/how_to_get_the_female_gerudo_clothes.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_19ab1172a19c4966abc7ec7248019af0.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14992 2152 bytes
SHA-256: de4c5a1b472dff3ce629380cd3ec210434dab83d4812187e77c4a121f3bd431e
font_01_sfnt_off00015360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15360 5276 bytes
SHA-256: f769e8072178034a058b2a982ae2104919d2b7b3e86d832a7422421ba4bf5434
font_02_sfnt_off00016536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16536 15524 bytes
SHA-256: 7aa4615e277601fd6dd601f8c016d3fa7cba5a513268a1607226054fef0a2181
font_03_sfnt_off00019794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19794 16280 bytes
SHA-256: 21e5e409b15dae617227af2914cd50f478a3e3bc635e96088d0b44d21974ed4e
font_04_sfnt_off0001ad23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD23 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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