Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fa615001795164…

MALICIOUS

PDF

71.1 KB Created: 2021-04-01 06:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed52b124e37cfcf38a75834ecc7e3bc4 SHA-1: 11a51fd38c7e9fe8e79a55582faf5602f86f9346 SHA-256: d8fa6150017951642613d16be3f83464da4050220d330d668d4ef9cc571d5357
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 0.9992

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://leonvi.ru/strik?utm_term=camaro+repair+hood PDF link annotation
    • http://gazupoz.sportsontheweb.net/90227523593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_601842dce2bc4.pdfIn PDF document text
    • http://waystep.site/tasotazusawozetopegdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_603bbe3697f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426571/normal_601bc23d01174.pdfIn PDF document text
    • http://eagleaff.com/mars_weather_factsi0spd.pdfIn PDF document text
    • http://hugertely.xyz/what_is_repetition_in_principles_of_designb9zkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_60491c7697855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_6000f60d35254.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/paper_bunting_template.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/ms_dos_commands_listflo88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_6060197fded5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486353/normal_5fde25232f7d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_60521942c5fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_6052387a513b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6013c25c59a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_5fe626438d606.pdfIn PDF document text
    • http://modarab.mygamesonline.org/acca_paper_f6_taxation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5fffe0c828360.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/affairscloud_weekly_september.pdfIn PDF document text
    • http://gromstroy.com/zelowoxefepogepuzigyy18j.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/95580769850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosijikis.onlinewebshop.net/agentes_economicos_en_economia.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_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 4892 bytes
SHA-256: 516e66669cc802bf5e9c0631c05acbebed67ea1d04d8cd5af9abceacfa219e0c
font_01_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 10708 bytes
SHA-256: b787f195ed5355bf3797e31b4db589373705d00af2c8f81935138577d3d26694

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