Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1395e6aae4c5b19…

MALICIOUS

PDF

74.5 KB Created: 2021-03-02 15:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d80f59a51b9aa849815e0a4a772a6a25 SHA-1: 32e1aba4c6e397c6340cd448e08ff22bbe4a21c9 SHA-256: f1395e6aae4c5b19d607775e80f87546d49534a34115b534163ba612f56931dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://baarspo.ru/123?utm_term=frederick+copleston+history+of+philosophy+4+pdf PDF link annotation
    • https://cdn.sqhk.co/govazofaj/jhjdkii/74175139743.pdfIn PDF document text
    • http://lamovingcompany.com/craftsman_shop_vac_filter_17816_ace_hardwarexbx5f.pdfIn PDF document text
    • https://mizabago.weebly.com/uploads/1/3/5/2/135299272/398371.pdfIn PDF document text
    • http://return-0.com/904716902061wv3o.pdfIn PDF document text
    • https://cdn.sqhk.co/timugulirebu/SgeNoij/horizon_credit_union_loan_login.pdfIn PDF document text
    • https://zugivosiruboni.weebly.com/uploads/1/3/1/8/131858419/81ce0c12e.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/sigaj.pdfIn PDF document text
    • http://load-bcp.com/nitarebisun8epfy.pdfIn PDF document text
    • http://beststudent.space/62629229949bjpt7.pdfIn PDF document text
    • http://setofexperience.site/tilupseznx.pdfIn PDF document text
    • https://zugatuwedi.weebly.com/uploads/1/3/0/8/130874050/gumunusaxere.pdfIn PDF document text
    • http://13millions.store/lugujdum3z.pdfIn PDF document text
    • http://nonretloli.site/95912409362lbx8n.pdfIn PDF document text
    • http://tibisibafub.iblogger.org/netgear_wn3000rpv3_firmware_download.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/5898353.pdfIn PDF document text
    • http://quickpapp.online/gusimuletibanewjzak.pdfIn PDF document text
    • http://busibear.com/entry_level_rn_resume_template1nbpz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rezopokus.epizy.com/64398726772.pdfIn PDF document text
    • http://fudixuxutinizow.rf.gd/warhammer_codex_release_schedule.pdfIn PDF document text
    • http://bubewap.rf.gd/72804665288.pdfIn PDF document text
    • http://wotujemun.rf.gd/performance_parts_for_2014_dodge_ram_1500.pdfIn 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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 5240 bytes
SHA-256: 6e9e53ae71e7bf35c305cbabcb5ad720e8efd2dbb16e5fe01ace5d62473525bc
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10568 bytes
SHA-256: 358a2e6fef582729bef41b260e9530833f32b14a6cb68e6a38ce1a1813bdb583

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