Malicious PDF — malware analysis report

Static analysis result for SHA-256 278d51905876e4d4…

MALICIOUS

PDF

86.5 KB Created: 2021-03-13 21:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4514c8c1061632bed69bffc6cbf4b5f0 SHA-1: 76b328415bf22b1bc444f711d75b884080ca8f7e SHA-256: 278d51905876e4d4bf23a6f16ce834ba7590c0e17d17b42d3844d325ab3fc095
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The presence of numerous external links, such as https://ponafet.ru/123?utm_term=ashes+cricket+2017++free, suggests a malicious intent to redirect users to potentially harmful websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=ashes+cricket+2017++free
    • http://zibodotuf.mygamesonline.org/basic_accounting_general_journal_entries.pdf
    • http://wumiwuzigimo.mywebcommunity.org/relationship_between_electricity_and_magnetism_is_known_as.pdf
    • http://zoxodur.sportsontheweb.net/computer_networking_a_top-down_approach_8th_edition_solutions.pdf
    • http://lipexifinidoda.scienceontheweb.net/62561703800.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dukexajuj/serious_delinquency_on_your_credit_report.pdf
    • http://jisunopesaluzi.atwebpages.com/98353143167.pdf
    • https://s3.amazonaws.com/piwupevivotixi/designated_survivor_imdb_episode_guide.pdf
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_8697ca573b1648c991ec1cbf772acced.pdf?index=true
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_35fc7228ce83481f84909af488eb590f.pdf?index=true
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_6207f0f8611b4ad3a5bcb68aa8fc1e98.pdf?index=true
    • http://lexamokoxerum.atwebpages.com/teluvutedilaz.pdf
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_9cfcee19fcf345d3b120550ae0476875.pdf?index=true
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_570e1dcd46954fd490748b8fe7a62697.pdf?index=true
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_77ba3a42af00496199f3313dc7e325d1.pdf?index=true
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_1bab5ef1004541c98d965acf934cb494.pdf?index=true
    • https://s3.amazonaws.com/luborinizu/petsafe_wireless_containment_fence_reviews.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/75579222860.pdf
    • https://s3.amazonaws.com/nazekisigiduz/80088664136.pdf
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_3532d19ab7ad479ea69a28c194c964e7.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_bcfbd4be8afa488fa137f665d998aab5.pdf?index=true
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_c34fdbafdc1e4c9ea349e0d7f7374d0f.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_879ea2872eca48afbf95579f5170b0ee.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb31.bin
a2274251c54aca4f50947085e57b3bfea8ffb904c914a0217f195325703e3325		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 5188 bytes
font_01_sfnt_off00010cee.bin
7a8b3d580720a3105994a4008934b5634a70628f0a9c75632ac447d86e3503d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 11512 bytes
font_02_sfnt_off00013469.bin
6b5fadd2f52bc1ca77e7aa2b1b7aa60fe2d97728aca7f1a06ec49f887284dfb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 16660 bytes

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