Malicious PDF — malware analysis report

Static analysis result for SHA-256 836c57de84434da6…

MALICIOUS

PDF

77.5 KB Created: 2021-03-08 09:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 18760792eb8c316ed658775c0ca16f79 SHA-1: 990ebdd4ba2d8bd6ec70e5668b73679e357fcff7 SHA-256: 836c57de84434da6be58b734ee3459aaf1bac369856be311dc4c96b8269b1e64
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=supersu+pro+cracked+apk+download PDF link annotation
    • http://venovagom.iblogger.org/43657386453.pdfIn PDF document text
    • http://natlegend.space/imdb_girlfriends_guide_to_divorce_coachmsru8.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/aviation_weather_services.pdfIn PDF document text
    • http://4escam-bot.online/business_administration_salary_2020kmjrh.pdfIn PDF document text
    • http://secureappeal.com/el_modelo_atomico_de_schrodinger_y_sus_caracteristicas4ftn0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5fefdf91f1446.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/lozojelewoboga.pdfIn PDF document text
    • http://organic-ita.space/11130793226xgken.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/american_red_cross_jobs_buffalo_ny.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/63428515982.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/8640919478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5fd980b76b06c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a1d4d2-c98c-427b-8592-8f3790c16cb2/baby_girl_clothes_sale_online.pdfIn PDF document text
    • http://wanabovemuzume.rf.gd/when_god_measures_a_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f891b922-2dfa-404e-9bd1-3ff3ee2dba9f/champion_air_compressor_parts_online.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_e0dd353217134872a2eede80909df728.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56974629-00a3-449c-ad46-ad65b49c4366/99513450278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35f8982-e37a-4226-8236-46b87a3ddd1a/dyson_dc17_absolute_animal_vacuum_parts.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_5168c0dd02ed460689e3d126eaf2682b.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_5831a5c837054de7a481990f3bebb0f0.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 5324 bytes
SHA-256: 0545899550dc92881197bd9a68431ffe2285d7932014c8e4edb3273498f10978
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 1796 bytes
SHA-256: d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a
font_02_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 10468 bytes
SHA-256: 8b3c88909595fb55529fec3ca80f01b360be7ed32e483f0f9387482073380913

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