Malicious PDF — malware analysis report

Static analysis result for SHA-256 472a41eb7e75afd3…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 22:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5294dcc54729845e90de4d7ca97b19cc SHA-1: 0868b6456829701d68a0b26f66ae37ce129c7f5c SHA-256: 472a41eb7e75afd3b0f6a8e450878e2d27aff94aab8d66732fcf86b803590139
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware delivery. The presence of 'utm_term' parameters in some URLs further supports a phishing or tracking motive.

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://pelibifir.ru/123?utm_term=cisco+cwms+datasheet PDF link annotation
    • http://pitushok.fun/what_is_data_coding_in_computer_scienceau9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_6042c25235200.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/hql4She/mp3_music_player_for_windows_7_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_6047f5f7d5bb1.pdfIn PDF document text
    • https://cdn.sqhk.co/jodidone/vPJigjf/zivobinanegewemez.pdfIn PDF document text
    • http://repochka.site/sheets_app_for_pcg5nam.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/letter_sound_activity_worksheetsubwe7.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/85fca0eb-b79c-482f-b459-cf2ad57352d3/30607911771.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_dc755a2d9ee14a70b7e8db0b343daa57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/292df907-46e1-4dcc-a94c-43eab0c74e82/tuporarumorufuvexovozesuj.pdfIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_830416cd8fe44cfe8953195a984ff85c.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_2436f04a7b4b42149109a6eef89bb174.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_e6cd1af614004f76894f28873bf47958.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_ae1739945b0e4d919de4ee12337496cc.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_af3cd299eb494626997d4fe7f76a5394.pdf?index=trueIn PDF document text
    • https://dd54f144-242a-4a88-9385-6c39f9996aab.filesusr.com/ugd/9f32c1_d1c91e66810f4d4ba89c2a42091dda6d.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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5048 bytes
SHA-256: bbc29d72eec5f52fd6828a37acb4cbf6771f8e06672c232607e915b0622edbb0
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 11148 bytes
SHA-256: 2dc1c92ba2a830bb1c6e7f21fb8d2771b5020b3d71a5622f522080b90bafd370

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