Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df3d152fc88e2dc…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 19:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d48ad47e876eb6f2bb493486831ec49 SHA-1: daaac8af292240149bbcac1f65a8c0fe0ccefc59 SHA-256: 8df3d152fc88e2dcc25a8f2354e419b64c51e2e488a728aefca6d75d5ad20a31
156 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 0.9996

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.
  • 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://seumenha.ru/123?utm_term=antivirus+app+for+windows+7+free PDF link annotation
    • https://cdn.sqhk.co/bisegepamitu/jYfhiEu/teacher_appreciation_week_gift_ideas_preschool.pdfIn PDF document text
    • http://souve.me/32691415076tz8bz.pdfIn PDF document text
    • http://kinoogf.space/72050986558fgwkw.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/iiacKPz/tank_war_machine_live.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/QPVichf/mechanical_energy_definition_chemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/Xghjg4U/78586225828.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/hijghbs/21197870125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_0ee59634d210436c9d1e9524247c3370.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/hotel_double_bed_sheet_size.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/9171945764.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/sharp_aquos_32_inch_lcd_tv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/gutodowujezomefinidu.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_263438b6c88643f39c66565cc78ee51f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satuja/appium_studio_plugin_for_eclipse.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/home_care_risk_assessment_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/51164136755.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_12b8c1b40bb04e39aa1a8eaeb75fb941.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/pokemon_sun_and_moon_anime_character.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/peralapezawoja.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/zumobo.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_80c71e457080405baa2b64485d6a2f76.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_7b369ac26d5d46b5ae5a6989318d543c.pdf?index=trueIn 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_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 5224 bytes
SHA-256: 4726bd20de5644b6cde700c8b079bb6a0bc648136bdbf9464243ec9b2ca33e5a
font_01_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 10868 bytes
SHA-256: 9feba268c2bbf398803ff1f9cf8d1cecf54162aca04e18527e4bb0f28e179683

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