Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fbe8d692dd92d3…

MALICIOUS

PDF

81.5 KB Created: 2021-03-17 18:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: af8b2d6d625af40c0094c5fbdd43dcca SHA-1: 107625079d365b0c5f1bec39d45b25580819751a SHA-256: 37fbe8d692dd92d3bfda000821c4b6d5e01013ae7aac80e5bb731800012b3228
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that point to various websites, including potentially malicious ones like 'maypoin.ru'. The heuristic 'PDF_SEO_LINK_FARM' suggests a deliberate attempt to create a large number of links, possibly for SEO manipulation or to distribute malware indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=how+to+rap+for+beginners+clean+up+your PDF link annotation
    • http://bilet-pdd.site/unknown_bacteria_lab_report_microbiologyp7wzi.pdfIn PDF document text
    • http://urolog.xyz/jovovefifaftu4c.pdfIn PDF document text
    • http://salet.store/vuzugeralunimetonulud088n.pdfIn PDF document text
    • http://nuverlites.online/wimoburunalopofojuwuroz.pdfIn PDF document text
    • http://arenaprobet.com/rofitabika32sae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7607dd8-00b3-4145-9ee3-a17ff39fe3f8/how_much_does_it_cost_to_put_in_motion_sensor_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7478a6d-b615-4a9c-80f6-c5abc986779a/2013_dodge_avenger_sxt_horsepower.pdfIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_4cadef0b758c4bcd9953091998f1d33f.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_4db21641c2074db6ad95807f581be097.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_83d11334620a4445a1dbe5e7eccfbfc5.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_eb1fd815f60b41bda9b43827350cfb4c.pdf?index=trueIn PDF document text
    • http://kejijisutova.epizy.com/wosipogofikuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6c28a6-983a-4234-87da-0ce66f641042/asus_rt-n12d1_repeater_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec9af9d-c60a-48fd-ab14-160541307ced/vanig.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_4b97d9c9a5544ea9b7710f4bd60f7e55.pdf?index=trueIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_4c91147d1f2f4373a3068d57f5f86924.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_e75951b3a8224d2b87e44df9619332f8.pdf?index=trueIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_bb9116c656d04ef58896cb1063bb5c0c.pdf?index=trueIn PDF document text
    • http://kinikodiraxo.rf.gd/4935613466.pdfIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_c63854a10f3f46a8bde259a153469467.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_b40301d89eb3458fac72b559a8bfe04e.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_2a5f918892d14e39afc783416d441bff.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_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 5476 bytes
SHA-256: 5a3a94ba4c8c94c0503be7c64b8c3469489d98470c6591c83d9d2a451d0b58e7
font_01_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 10940 bytes
SHA-256: 56dbfd9d4e6270d80093c50721fed425afaf22dd015d1005177708aea7c75fa6

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