Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7fb594437d65a7…

MALICIOUS

PDF

81.0 KB Created: 2021-03-05 17:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cba6d8e1e21433f101a88c9aad7a80d3 SHA-1: ded03ad0b55df7c12c31b39b977ef7486aa0f2db SHA-256: 7d7fb594437d65a72e6bf685ae1fd95df466bcf6dc903b0ca832ce93ead4c721
66 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of the embedded URI suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://dugedepap.ru/wix?keyword=bns+kfm+guide+2019 PDF link annotation
    • https://zexiditituluw.weebly.com/uploads/1/3/4/7/134734655/7016238.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/1e88dc8.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/193134918.pdfIn PDF document text
    • http://roralopokuzej.22web.org/olympus_social_network_psd_template_free.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/judarijotanutupuxig.pdfIn PDF document text
    • http://bejagofeteveba.22web.org/kikavedumemazow.pdfIn PDF document text
    • http://dikuziropuviv.22web.org/bleacher_report_live_app_store.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xisefowu/vipatosazigiwipibuz.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/types_of_statistical_estimation.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/shankar_mahadevan_tamil_songs_kuttyweb.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_07faab11dcad4770b74060f577f75404.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_cb5df21770c7424e80def4d40ed383d5.pdf?index=trueIn PDF document text
    • http://juvadapirepaf.epizy.com/vidmate_app_latest_version_2018.pdfIn PDF document text
    • http://wemubivoparuf.epizy.com/bubegovavuputaj.pdfIn PDF document text
    • http://zevusup.atwebpages.com/driver_hp_pavilion_dv6_win_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/kopasitiperoko.pdfIn PDF document text
    • http://forevar.rf.gd/innovation_funnel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/authority_letter_format_for_nesl_registration.pdfIn PDF document text
    • http://josilofogi.rf.gd/deep_freeze_not_showing_in_system_tray_windows_10.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 5484 bytes
SHA-256: e36e7b8b83948b00f9d61861d85aa8e17f371d1c008ab174635dcea3db52e496
font_01_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 9828 bytes
SHA-256: 25c30f17ef0588035e8f6495fda6e9746aa1070796be711458ee5778fb06ca5d
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 16744 bytes
SHA-256: b6e04a927c2012552519e1d950d70c0df76771797756fbc90fc2357d6becb0ad

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