Malicious PDF — malware analysis report

Static analysis result for SHA-256 029410a0402d3e91…

MALICIOUS

PDF

74.8 KB Created: 2021-04-02 22:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a0cfcb09f178a2c38de2a2f2873ac4 SHA-1: b6b5b129076c03e0c2ed10cd92c65f63c92837fd SHA-256: 029410a0402d3e91feeda78546ec00865df6f8b8ab8b467a0b6178c39d620fd8
156 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 phishing or trojan payload. It contains a large number of external links, many of which are SEO-themed, suggesting an attempt to redirect users to malicious sites. The presence of 'acrobat_reader_pro_apk.pdf' in the extracted URLs indicates a lure to download potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=call+aundi+video+song++hdyaar
    • https://cdn.sqhk.co/fikalibumi/cidO88b/acrobat_reader_pro_apk.pdf
    • http://discount50.pro/1984_chapter_10_questionsfdoyg.pdf
    • https://cdn.sqhk.co/sevijeruba/gchikhf/gakixojomebaratides.pdf
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5ff51e4d58a62.pdf
    • https://cdn.sqhk.co/lokabawopup/SjhoR3e/22806683577.pdf
    • http://resimpub.com/taber_s_cyclopedic_medical_dictionary_23rd_edition_free_download8mfk2.pdf
    • https://static.s123-cdn-static.com/uploads/4417413/normal_6004877d49fbf.pdf
    • https://cdn-cms.f-static.net/uploads/4455196/normal_6046b9c0d7658.pdf
    • http://hookup153.site/62889878517omaqw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_ce799a521580419fb8273931d2e4b464.pdf?index=true
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_d58c21de7fdb4d2a97d6cc98cad35736.pdf?index=true
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_abe451cbab88411dad876e957a30d6bf.pdf?index=true
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_1005bc1ba033479ab762907ac6f087a0.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_4b115db3d5ec43d5a89b26eb00951213.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_b5175f2dc21a443e923ad97633922d89.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_0fa4b35c408b47fbb6ffdac8825120e8.pdf?index=true
    • https://3c59ccad-08dd-474b-8af0-a42d91f20399.filesusr.com/ugd/489ff0_e6634c7a5f484700b49016a680e94898.pdf?index=true
    • 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_off0000e8d2.bin
3c84633406f8d2a096645656f4371a906c8dd95fb76d56bd0e421ee0a84459ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 5156 bytes
font_01_sfnt_off0000fa5e.bin
b4243d20dd55c1c771b95b76af32b0235e81de40202976ba06a1d965152a8f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 10452 bytes

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