Malicious PDF — malware analysis report

Static analysis result for SHA-256 7541431ff5b51f07…

MALICIOUS

PDF

74.7 KB Created: 2021-04-07 04:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fd8e5604480ad3720c5405aceb08671 SHA-1: dcd809385063ecc3e560e94f19c631b82f80696e SHA-256: 7541431ff5b51f07d864e8568a7e8f95080fd013eadd9d575d31f090f4ee079d
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. One of these links, 'https://jumiwimov.ru/strik?utm_term=glacier+bay+faucet+cartridge+removal', is flagged as an external URI. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jumiwimov.ru/strik?utm_term=glacier+bay+faucet+cartridge+removal
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdf
    • https://cdn.sqhk.co/potebuso/Aahi2ha/misewewenokixejiv.pdf
    • https://cdn.sqhk.co/sasibasodiwu/jbmVKgj/champions_cup_soccer_tournament_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ebd14f52-0271-4ea9-b5cf-341768e8636b/lexejematewamukofo.pdf
    • https://s3.amazonaws.com/ponivotigegepub/colocar_assinatura_digital_em_documento.pdf
    • https://uploads.strikinglycdn.com/files/589a3d98-fdc4-4a1e-9f01-251261e81b57/55933572728.pdf
    • http://kowepewaxobebi.epizy.com/marantz_sr5007_remote_app.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/apple_earpods_android_alternative.pdf
    • https://uploads.strikinglycdn.com/files/eca78f7d-0daa-4b5c-a511-2a954f782139/33027552200.pdf
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_e66c3351da204a44abf73199ac845e54.pdf?index=true
    • https://s3.amazonaws.com/julexekubaj/bootstrap_django_form.pdf
    • https://s3.amazonaws.com/vokeri/red_cross_blood_drive_weight_requirements.pdf
    • http://pibanifadedo.epizy.com/guide_to_intermittent_fasting_keto.pdf
    • https://uploads.strikinglycdn.com/files/561d3e40-02d0-434b-878d-5f3df7b37fa2/finite_element_method_explanation.pdf
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_ecdb190648034eed953c42554bed0929.pdf?index=true
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_26ca39fe57d44ef2a60d5344d59b293b.pdf?index=true
    • https://s3.amazonaws.com/laradusa/16773156666.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/62320724582.pdf
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_8e4647bec559478793c0ff3e671c8790.pdf?index=true
    • https://s3.amazonaws.com/zoromexemuzid/ordering_fractions_worksheets_5th_grade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39b.bin
a1cfa74a889b781db4d3e4ddf4cfc09f61d883f34dcdbf4cd10fb5c04e721d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 5496 bytes
font_01_sfnt_off0000f64f.bin
c841a010315f4e20d4fff2d4d21ab9e0a112bc9cf860f4e776c15acca4fc3a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 11036 bytes

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