Malicious PDF — malware analysis report

Static analysis result for SHA-256 2734b35da5edb484…

MALICIOUS

PDF

90.8 KB Created: 2021-03-12 06:37:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 85e985cef82cab1aa9e1bbfceeb7332d SHA-1: d85923860021c9493803c7fbc70df8b5a9d6725b SHA-256: 2734b35da5edb484d9e424492e079a4006fc3dbebee022663913a24a34f95eb2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://baarspo.ru/wix?keyword=aws+certified+cloud+practitioner+study+guide+clf%25E2%2580%2593c01+exam+pdf PDF link annotation
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/8ddaff7.pdfIn PDF document text
    • http://dusetufo.22web.org/sphax_1._13.pdfIn PDF document text
    • http://tefuzomabi.iblogger.org/73399855091.pdfIn PDF document text
    • http://supijijuzumapiz.iblogger.org/how_to_reset_a_roomba_690.pdfIn PDF document text
    • http://sarepoxorak.22web.org/english_learning_book_download.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/4019427.pdfIn PDF document text
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/4635180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/lol_colouring_sheets_printable.pdfIn PDF document text
    • http://pozirumine.epizy.com/acr_form_bps_16_punjab.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/fujeburoromapepib.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/gogezokuvuwulezopi.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/merivelibadolufugesidib.pdfIn PDF document text
    • http://beviraveda.epizy.com/dream_on_glee_full_performance.pdfIn PDF document text
    • http://nununad.myartsonline.com/87257788720.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/73466283223.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/fowuripixazojir.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/59613850684.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/twitter_for_android_2._3.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/apache_tomcat_8_for_linux.pdfIn PDF document text
    • http://sawenisijupum.epizy.com/intercompany_transfer_sap_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/69404476263.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/which_da_bomb_hot_sauce_is_the_hottest.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 5952 bytes
SHA-256: c2d38141c68f39535e24aece47b6118998f3aa6ffb12c838abd61bba92224444
font_01_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 2512 bytes
SHA-256: 4dce65651168509d23c29733f7150cf533a8e6ef747e4a2aebe96b50709536f0
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 10888 bytes
SHA-256: 98ad0b67eca7b93d98cb5971b9391b54fea13ad55ef81f22fb6758cad6b2425a
font_03_sfnt_off0001442b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442B 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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