Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed32f1612afd0e99…

MALICIOUS

PDF

67.5 KB Created: 2021-03-21 08:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 82772640e10b525ef2a5360cf133fd0b SHA-1: 431f4c0b4b0398dfb3238fe418678ac94df13196 SHA-256: ed32f1612afd0e99493cfd94e1636e140b0bc9670e412ce9839e5b74346bf201
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. It embeds a URL, https://ponafet.ru/wix?keyword=jaybird+x3+user+guide, which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, contains strings related to 'user guide' and the authoring application, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/wix?keyword=jaybird+x3+user+guide PDF link annotation
    • https://cdn.sqhk.co/zorimedi/ilb2jfd/lowukogegewonifox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_604c9ee7c2617.pdfIn PDF document text
    • http://mysteps.online/vumafivunivebxjfy.pdfIn PDF document text
    • https://cdn.sqhk.co/makekajet/nijhbAQ/mubavevezewiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_6048fcffdbb0f.pdfIn PDF document text
    • http://creditscoreusa.info/wine_enthusiast_wine_cooler_beeping9s151.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/wvijNih/texutilexolomavexawedima.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/16a4c0f9-2c88-4d51-bf10-c6c4aab5edfb/collections_textbook_grade_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/the_rules_of_magic_series.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_611eab02a0c44d609c5bb0f751b66b17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/insinkerator_hot_water_dispenser_leaking.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_0d50c48d32434136a05f766063b8192b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemupajese/inventory_report_quickbooks_online.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_9291909d5b1645af91a37fd6725b89dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8382083b-ea1b-46dd-b10b-41768d7ebb3f/pax_romana_definition_ap_world_history.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/final_fantasy_7_original_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f67ec93-5d2d-4776-bbdf-6ebc91f7bc79/lidupodenozatafakitagus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c4cfa6b-f93a-41ab-9d87-fa988483da9d/jopejilogafevalofedul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766d7e3a-013c-4b7f-b1af-c3ccc01a2e39/31410267282.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_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 5424 bytes
SHA-256: 55c2c01c089445e8e452c6b0b9a15729912af86781ae35a824c8cac8dcfd9b86
font_01_sfnt_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10384 bytes
SHA-256: 2d32e84320612690d2dd4d98c87b5bf95fedd730bcc25ffead45321ee2dfadd2

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