Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f30b555e400b9a…

MALICIOUS

PDF

90.2 KB Created: 2021-03-06 23:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7800e13a2f058555906f77efb6b5c434 SHA-1: 0b239a3a77ab61640b18105ad3bce9f08cc29ad3 SHA-256: 37f30b555e400b9a665541af02131ffb5c4e496209de08b9517cb80cc5379815
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a primary focus on `https://soxebez.ru/123?utm_term=how+to+write+short+essays+in+exams`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=how+to+write+short+essays+in+exams PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482623/normal_5ff7de28ae38d.pdfIn PDF document text
    • http://dostafood.xyz/937714100744tpza.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/gfbhjha/nosoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5febcd28d6358.pdfIn PDF document text
    • http://watertea.space/wavepad_apk_latest_version7itxc.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/lotos_lt5000d_plasma_cutter_review.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/balancing_equations_worksheet_answers_1-20.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/ifDgfgd/driving_car_with_too_much_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/bhfghih/66792565718.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/gj8bxxw/69678114233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_5fdb42d7de462.pdfIn PDF document text
    • https://cdn.sqhk.co/jekenilegefe/NZhbRC2/mad_max_fury_road_villains_wiki.pdfIn PDF document text
    • http://omerkatanalp.com/philips_9000_replacement_shaver_headsrmfnh.pdfIn 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
    • http://novosumagib.epizy.com/62946867918.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_e873f21bfb0c4289a7073acb6bcc62e7.pdf?index=trueIn PDF document text
    • http://kamupipoduw.rf.gd/medtronic_neurosurgery_product_catalog.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/91250283624.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_d1f130f6737342ce83f106fa896f323d.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_87e5e1a1ff424d6ca7a3257a74cb4a89.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_e59280e4520347d397e2a7b392dad1ff.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_501e5026d2f94c2a8715cbe218bc215d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 4904 bytes
SHA-256: db74fe7ea9c76a947c9cdfe4d001d2d1741b89ca0f15a01b92f9783007a73c9e
font_01_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 10436 bytes
SHA-256: 551b7606782af67ce36d60eedd2bf6a81d039ed851d0e03bd29fb4c88228cc17
font_02_sfnt_off00014ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CED 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.