Malicious PDF — malware analysis report

Static analysis result for SHA-256 908ac72fdf30677d…

MALICIOUS

PDF

84.9 KB Created: 2021-03-17 18:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1d218685df27293743e30eea51a5f4b4 SHA-1: 996edb2fb0735dc72449de1681179edc056d5989 SHA-256: 908ac72fdf30677ddd6c0178b485599e6ddbd9c41e3e1f53e7ef89e9e9a225eb
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 0.9998

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://kuzutuzo.ru/strik?utm_term=best+keto+plan+uk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419654/normal_5ff96d6663e0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5ffb22519c1bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_604017a8e36be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5fd3194c9b12f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fccd4927abbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_603a7db0b4602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_601fafa36a71b.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/what_causes_a_dryer_to_run_but_not_heat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_06ee47e6d03744b98815b11d0afb8f0e.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_4aee5023c56f4de6948cfc2ed03173ac.pdf?index=trueIn PDF document text
    • http://pizuzol.onlinewebshop.net/nenijulexisegujevulular.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_ce39f3b2fe6b406fbd8c6b93f136c7cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1940b1-d203-46c3-8c21-32d4bde5bbe8/price_of_generac_whole_house_generator.pdfIn PDF document text
    • http://badamowafe.onlinewebshop.net/vifojamokipovenesiduduxil.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_e981bf7665e7472b9e84ee354bd6064c.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_463a47fadcff4952a57deacdb888ea61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/489547f4-9e85-4a48-a5bc-c3a10a094ed0/can_a_vitamix_make_smoothies.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_9424c63922f349f9acebeb7f42a01ffb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 4828 bytes
SHA-256: c3780325b68f2e2c4a3586f72111cd79efca3a449808545fee71e2230bf78ac8
font_01_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 10952 bytes
SHA-256: 2cb2d506b5b82119d17fcf041746d2ad4451b199d8d9859555f1e7335ef88901
font_02_sfnt_off0001319a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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