Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72b66c0fbfd8dcf…

MALICIOUS

PDF

81.0 KB Created: 2021-04-02 15:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cc01a48cb3068a71bfec2a5a0236ded8 SHA-1: 70c437d8557e54771e155fd39ffa72a219c9da94 SHA-256: f72b66c0fbfd8dcfe763a31ea3a27441b1e30f76c155c6d3189d946cca5a3628
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on potentially malicious hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=boss+tu+2+tuner+buffer PDF link annotation
    • https://cdn.sqhk.co/tenokesime/ggdVhgP/game_recording_software_for_pc_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455376/normal_6004fc67e9a8e.pdfIn PDF document text
    • http://usblighter24.site/17508002145hco6m.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/ifjghsM/19996113392.pdfIn PDF document text
    • http://pumba.fun/how_to_break_your_addiction_to_someonegw3sf.pdfIn PDF document text
    • http://aycotoro6.xyz/ruronusowajrx5he.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/ifjdgdW/water_slide_3d_vr_mod_apk.pdfIn PDF document text
    • http://copyrightshelpcenter.com/fomugemx5tv4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_600e21753ddc4.pdfIn PDF document text
    • http://openchambre.xyz/surokimugalz8fz2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5fe1d866ee27e.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/ijWuiib/90383396242.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/3c383989-cfc5-494d-9a95-f1e04c02d088/dejedasajudafagijopeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d264019-098c-41fc-afdf-eea8888bfbd4/cuisinart_bread_maker_paddle_wont_turn.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_2336229557154f2ca0e762debb8ccea5.pdf?index=trueIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_1e4529ef262a4a6185a3b5b262cd584e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc9b11c-a459-451c-8805-94b192225260/96677364477.pdfIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_0861dcd1b3a24c4798e7cd6dee020d27.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_00fd110df1164150b810599d3d080d62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34841c7-feba-470b-a683-393a0fd5bf86/7034798733.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_09a1fe97db0f40ab96bd542027ef04a2.pdf?index=trueIn 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_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 4840 bytes
SHA-256: a6b9c19093e2c6141af1da32a78f768dc691db549ace6cecf4cd047be6a85b6b
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 11132 bytes
SHA-256: bece1028bd738f9f168f1bdeb7e199cf2a75f2e532cde068b020df6ff2f8fa09

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