Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff90aa3fef24459…

MALICIOUS

PDF

67.4 KB Created: 2021-03-18 10:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 636422fd43d2477a620ac7f7471f2ebe SHA-1: 92c474a6da60f2d65875b50beb14f1d5a6ee22e9 SHA-256: 9ff90aa3fef24459cd90046a6dd4978e1002f5f3e0b9f4e92d474c37a061305c
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 0.9996

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://vilenefex.ru/wix?keyword=banner+letters+minecraft+tutorial PDF link annotation
    • https://tunogurepuxi.weebly.com/uploads/1/3/6/0/136054619/3877582.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/57722571299.pdfIn PDF document text
    • https://lajexupizad.weebly.com/uploads/1/3/0/7/130775806/zakegopudezewafijij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5fda435b36390.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/89021236664.pdfIn PDF document text
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/2654340.pdfIn PDF document text
    • https://xunipemadigorof.weebly.com/uploads/1/3/0/8/130813553/8551711.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/algo_trading_strategies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fc82fde77059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuminexozuvino.atwebpages.com/engineering_mathematics_gate_notes_download.pdfIn PDF document text
    • http://ruzovufu.epizy.com/92412523659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2f6150-a383-4cbd-8571-bb79477f5433/cybex_arc_trainer_instruction_manual.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_2e386cfbbf6d4fca850c25ddfbb5786e.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_6f76cabf0aec4d4ea4d2fb69f9956054.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b71b9e70-df47-4f1f-9150-891a4fefa3d5/52507151936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d54217-8557-40c9-9197-7800090ada37/the_little_shack_menu_el_paso.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_24f16d4914bd4faea9bfbb141dc45ee0.pdf?index=trueIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/mamubixagowegudutajapiwuz.pdfIn PDF document text
    • http://tuxavilewik.rf.gd/how_long_for_a_water_softener_to_regenerate.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_1ddcb5cfbdf3416080642f8b9e614b50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/523a8ced-715c-4d21-aa72-d4144fb34831/best_price_honda_eu2200i_generator.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_de8e8f31cdae4824a59244f62113dda2.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_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 5076 bytes
SHA-256: 77df7acf263b6bfcb3aa7631e18a279709c083611252e40203593be7e302465c
font_01_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 9920 bytes
SHA-256: 10c2c6c75cfa09508f31bb12355ed3abc388eaca2034009a8308cd4edb7996eb

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