Malicious PDF — malware analysis report

Static analysis result for SHA-256 41710cefb9c39bdf…

MALICIOUS

PDF

84.9 KB Created: 2021-05-29 04:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3da5dc8d397c833141ede3794642fb19 SHA-1: d7cec86d19fe38c6ccf91d268f5d3588ec7853d7 SHA-256: 41710cefb9c39bdf91e066dad04e09031ce48160dbdc86306e0f7a69c65b6958
186 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 0.9995

Heuristics 6

  • 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.
  • 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://dafemum.ru/strik?utm_term=coreldraw+x5+full+crack+bagas31 PDF link annotation
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/vejaxofoziviroke.pdfIn PDF document text
    • https://sojizekupiguj.weebly.com/uploads/1/3/4/5/134586608/2ee2f.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/1470253.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/mogili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_6029e2a32108f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366973/normal_5fc77a206af70.pdfIn PDF document text
    • https://bafejavug.weebly.com/uploads/1/3/4/7/134737311/bazoxipusogiwibisum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_5fe3c71b4e1a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_60170371827ad.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/1320b310e6f1fd.pdfIn PDF document text
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/risoxajojawazod-serezitane.pdfIn PDF document text
    • https://lenoloxib.weebly.com/uploads/1/3/4/0/134040664/nesodati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_601ee6d92295c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_603e94ccae7bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5fef520328a9e.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/9539241.pdfIn PDF document text
    • https://wutiboduselojo.weebly.com/uploads/1/3/4/6/134665342/4749875.pdfIn PDF document text
    • https://sojuvamufivuleb.weebly.com/uploads/1/3/0/8/130874470/8512537.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/a1dd99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_6069c0ad98f15.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/malituto-sosifogoxu-koruba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_605a9af23630c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 6832 bytes
SHA-256: 40e0ad21b19df3db216fd06b1281b08faf1616a5a4e0e4362360d049e0fe8d6c
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 5800 bytes
SHA-256: eb4fd7da263b2932a01e975b290bdf3d60b6031d877c68650b676e50e6023491
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 21544 bytes
SHA-256: 13e4159b9429705309e6f8b5a86d0ef29ddbd02210e19b4b73821370a7c2c221