Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d899f382bca1463…

MALICIOUS

PDF

73.3 KB Created: 2021-03-10 19:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ece37134c29a5437a10324d64f50e17b SHA-1: 5aca6cb921b25173ef3ce83fb34917337c441704 SHA-256: 4d899f382bca1463be648f50de6a310574af42f63ad03beaf2faae25b6b4d55a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://botokaw.ru/123?utm_term=chuck+mangione+feels+so+good+music+sheet PDF link annotation
    • http://zujamepu.22web.org/76144191599.pdfIn PDF document text
    • http://xajoraxi.22web.org/sql_server_database_engine_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_64f92be27d004237aa6b9138867a5c19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2096b188-bb09-4438-a495-7a7adf47c00f/how_to_use_fonts_downloaded_from_etsy_on_cricut.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/rikixafixawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dba02e-4903-4e9f-acb2-b3dff3db8169/tuzugadijanorenafoniziv.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_73d184915f2b4b0d9d72d7d70b82637a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/golf_tournament_fundraiser_flyer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/busegajoxumosamej.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_da44f56b24bd4af382b84dc1c41a457c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/android_lollipop_os_for_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/raguf.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_ba162e66fc1646b08015669b32a811ef.pdf?index=trueIn PDF document text
    • http://menenig.rf.gd/gospel_fluency_chapters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822ecac7-a7ef-4209-84ad-88c197d2d677/the_man_in_the_high_castle_season_2_episode_2_cast.pdfIn PDF document text
    • http://ripeterub.epizy.com/cookeville_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/le_rapprochement_bancaire_en_comptabilit.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/storyboard_template_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fff89a-4f96-4469-b8e4-774a273332ab/everybody_lies_lyrics_christina_grimmie.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/caller_name_application.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_93ca385666eb4ca1b1c3dbdbc875884b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/fobivogafirasarevexo.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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 5308 bytes
SHA-256: 137f99309d6999890b7b39ec207237dc00e1fbd8bbc7e0dac260f45871eff7e5
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 11648 bytes
SHA-256: 4f0971e6ced3f349fd90482b1ffb8fae32683d290c91c66bd54a454b01023352

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