Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d9e7fc0b4d2f7…

MALICIOUS

PDF

67.6 KB Created: 2021-03-31 20:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90974891026f326bc30da7278445d8da SHA-1: 884b8e50d458bc566613c1af7300a935550fbbce SHA-256: 721d9e7fc0b4d2f7932d77a0ef557c969e5fb83be554e01f4abeef748d412840
184 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9679

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://mezovuduw.ru/strik?utm_term=lexus+nx300+review+canada PDF link annotation
    • http://sosed.market/xosiro9p8f.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/bjejdeM/45375386975.pdfIn PDF document text
    • http://logoped-samara.ru/81037740356q4nwg.pdfIn PDF document text
    • http://abanca-electronica.com/cefsharp_not_workingwkapz.pdfIn PDF document text
    • http://obzorov.site/pujuvavururejc198.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/nhbYgdc/forest_stream_live_wallpaper_app.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/kufunorasidaweboro.pdfIn PDF document text
    • http://gidpopiteru.com/66343539131akkg0.pdfIn PDF document text
    • https://gegefajowib.weebly.com/uploads/1/3/1/3/131380265/6790651.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/agigie8/cunard_cruise_line_cancellation_policy.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/d2ghnji/70882559337.pdfIn PDF document text
    • https://gubuwogufulero.weebly.com/uploads/1/3/4/6/134608521/vudobatigobuweb-lubivazubaku-kazolev-sufabeviji.pdfIn PDF document text
    • https://xinuxarovota.weebly.com/uploads/1/3/0/7/130776268/b2f3422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_d8dbe10cda264bdd940ab09201aa25ec.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_d2b49fbe1fe54b68b00ac18464fdc604.pdf?index=trueIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_43a9871a961e44ad83659322c0c7f2a9.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_fe60aba741174569898ee73fefa980f2.pdf?index=trueIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_115c588747254648816f5bb8d35799b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45302f32-dcf4-4f01-b729-d3e204690c23/suntrust_bank_near_me_directions.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_22cb2e5394ef44d792b051fecbdff97f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49b157a-7d5e-4253-b130-dccf0d685b50/29680806802.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_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 5368 bytes
SHA-256: 3c28ae551ac7e6125e6ba8f2307bea6c54bd647937373054f4f66ca51a4ef57c

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