Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f649684d9e7999…

MALICIOUS

PDF

106.1 KB Created: 2021-03-17 04:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ea0d4d9decdf3d8a3f897f3a86d2e022 SHA-1: 34e630e9c6ecfb50d892b2362dfc7e453a2e7ba3 SHA-256: 70f649684d9e799939759422f12c718418650d6013d0d82d2ccb1311f0170ad2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The PDF also exhibits characteristics of a link farm, suggesting an attempt to obfuscate its malicious intent by presenting a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=life+nutra+keto+pills PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407782/normal_602fa9fe45356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fec7c33cdd5b.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/brother_mfc-8710dw_wireless_printer_setup.pdfIn PDF document text
    • http://kevekozulanilim.sportsontheweb.net/wigobexowipal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459062/normal_5fe527a96a295.pdfIn PDF document text
    • http://ragadugizidej.22web.org/nutrition_information_southern_fried_chicken_breast.pdfIn PDF document text
    • http://miwuzobi.sportsontheweb.net/70090895268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_601e68fc59604.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/95995531-76ff-4f70-8f1d-9a6f1f142735/5010205247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54b5193-7f44-4dd2-af82-f34e4ed638bb/kiss_the_rain_flute_sheet_music.pdfIn PDF document text
    • http://xafazox.rf.gd/how_to_use_omron_nebulizer_ne-c28.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_9d3d1b69bd224a96b88ead61a06c9103.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/gitirarivolup.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/75469870619.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/brocade_network_advisor_san_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d5c7b6-7df2-4edd-b3c9-1061f7350d04/sokutevof.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_15c4a9f74f414c40b0680c9b7e2b8f49.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_9daf125237554524933128f61612b367.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a516a5-48e9-4817-84ca-e14ef0eae06b/48696429938.pdfIn PDF document text
    • http://pamanivu.epizy.com/novel_so_i_married_my_anti_fan.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_8bed276c876747b7baa444462eefaae2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/98832907654.pdfIn 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_off00016118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16118 4900 bytes
SHA-256: 72798be6253cab2bdf40efb1b52800c3824305d6ed375d1668ffcdd02aae585d
font_01_sfnt_off000171da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171DA 12112 bytes
SHA-256: 8e88d0d09b59ebcc5fadb23b2b424cae1931b3ec9ab914903c6e9ac69e8b31da

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