Malicious PDF — malware analysis report

Static analysis result for SHA-256 827d4604f3b20951…

MALICIOUS

PDF

64.0 KB Created: 2021-03-30 05:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea2f4866b0064cd98ebf30bf072e18b6 SHA-1: 71513348e9e8df35613b041dec061c44d61da127 SHA-256: 827d4604f3b20951a6a9e321904b4a4011be74f6bff835e01fd8b5aac63f813c
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 0.8928

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.
  • 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://golowaki.ru/strik?utm_term=how+to+wrap+a+present+with+ribbon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412774/normal_6037559ba2c92.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/9209364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_601b7d1243a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_600d092bb1e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_60368a030c60d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_604d5cec7d528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_605f3a328e855.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/gigifowonul-vugomure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5fedaabd9d25b.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/amphitheatre_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446388/normal_603dea3fcb554.pdfIn PDF document text
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/807f06c441bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5fe7926cbe9de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepewitibafef.myartsonline.com/coordinate_graphing_pictures_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/husqvarna_viking_scandinavia_200_sewing_machine_price.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/basketball_diaries_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/ppsspp_emulator_games_list.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/15805998752.pdfIn PDF document text
    • http://suzifoki.myartsonline.com/cancer_de_seno_fisiopatologia.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 4856 bytes
SHA-256: 3eb252d40dce8d85cea30ee5bb34ed7417e85cc0737ddb1f26ee5cc80b741adb