Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f256cb5dc5ee25…

MALICIOUS

PDF

65.6 KB Created: 2021-02-24 13:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 729c4445d43d35402278fe4c6f0cd762 SHA-1: 6dd8cfd8e6c9e0c11b49818aac9ce627e74489c0 SHA-256: 91f256cb5dc5ee258039e4896245f57a0c2d278414d8296de2e8499d6312bb59
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.7866

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=iso+9001+certified+training PDF link annotation
    • https://cdn.sqhk.co/wadupaxi/eXaouii/50547163943.pdfIn PDF document text
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/ddc5ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601b516ea32e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fe705655a721.pdfIn PDF document text
    • https://toruruxixe.weebly.com/uploads/1/3/4/6/134698343/3f6815130f92ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6018b479b6754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_60296b0403d4e.pdfIn PDF document text
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/d3a5e16ee28c5.pdfIn PDF document text
    • http://djami.ru/selodazuvomulisupajiq0drr.pdfIn PDF document text
    • https://rimemukevip.weebly.com/uploads/1/3/4/3/134318995/5412181.pdfIn PDF document text
    • http://begemotiks.fun/marketing_and_communications_manager_job_description_sampleurems.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/binabefanujo_rejare.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/hb3DbGi/tozonasofezikemakadufar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fcf12f2beb9e.pdfIn PDF document text
    • http://cardioactiveuficiale.site/pubozufufumixamafefis0y8in.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 5232 bytes
SHA-256: 349ee967cf199eeab13d9e1b9e278bc43704653c854d3b4e620293ab556681e5
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 10576 bytes
SHA-256: 5bd251b137b955fde7f47b55791cbfa02dfa0e0214ee2532ef0fc54590aa1b97