Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b801d0b3ea6013…

MALICIOUS

PDF

68.5 KB Created: 2021-03-15 01:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0368b607c22f7f3fd465919137c33653 SHA-1: d26b0e0adfd099e65c8cd1d1e6b7aa878fea82d3 SHA-256: 81b801d0b3ea60130850be3f0a5501395ec333f4cd23e99ec0d02530ceddb1f2
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=2017+harley+davidson+fatboy+owners+manual+pdf PDF link annotation
    • http://natezaka.iblogger.org/libevasufujibo.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/new_practical_chinese_reader_2nd_edition_workbook.pdfIn PDF document text
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/kuwop-bixifis-sukivat.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/safaregowusimo.pdfIn PDF document text
    • https://mutebomex.weebly.com/uploads/1/3/2/7/132740724/1653c0202.pdfIn PDF document text
    • https://wesatelifap.weebly.com/uploads/1/3/1/8/131871597/xajuv.pdfIn PDF document text
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/1896578.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/ethical_hacking_review_guide.pdfIn PDF document text
    • https://zusiwujewanu.weebly.com/uploads/1/3/6/0/136054437/lekaximizetafamu.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/rijosinatelefoxi.pdfIn PDF document text
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/af8d5d1a.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/vujowe-jifedubizoxodaf.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/72377157740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_1ede363faf3c48aa89a5e94085af7bdb.pdf?index=trueIn PDF document text
    • http://fojosotum.myartsonline.com/gexarug.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_9e3f52a72d324b5792fc08a0b286a9fa.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_6dc28252968e4265a33bfffc2b9b26f3.pdf?index=trueIn PDF document text
    • http://daxevekiwenux.epizy.com/15758347474.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_61ddfc439ec94f32ab13faffc159f1c1.pdf?index=trueIn PDF document text
    • http://xilibosukotijob.epizy.com/8051899353.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/85891013556.pdfIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_19e90de92a9246669dc4e2b95f07d5fd.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_off0000ccf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF4 5988 bytes
SHA-256: b6ca73afe984cde1bb7f67a6f08c30209571b93c360b6e9a0938a3d0a472ec73
font_01_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 10112 bytes
SHA-256: c9b189180bb809c8b0262caee4b3ee6113921054548c0c9b0d23cdaebb93b04c