Malicious PDF — malware analysis report

Static analysis result for SHA-256 836fecb8b83d03d3…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 04:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 68cf1406feae1e7cc28c24d3b30b91d3 SHA-1: ab1b2483ccc90debd4d55ce73b87baf9c4a92a04 SHA-256: 836fecb8b83d03d30f220aebd7378229e5017a041e3d0629cc5c4693449be9d8
126 Risk Score

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://xezojetit.ru/wix?keyword=hidden+mysteries+joshua+david+stone+pdf PDF link annotation
    • http://piter.store/lyrical_dance_costumes04wkk.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/what_does_time_and_space_mean_in_a_relationship.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_603f30045dd12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5fe00f7629abe.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/76817948064.pdfIn PDF document text
    • http://trokot-newshop.online/homogeneous_and_heterogeneous_mixtures_worksheet_answersjcf5b.pdfIn PDF document text
    • http://allerop.xyz/calming_ocean_sounds_freem7we8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_6054afd25c222.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/architecture_portfolio_examples.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/3296be46-74bf-48f2-bece-8fd00ad7c68d/how_to_draw_a_woman_figure.pdfIn PDF document text
    • http://somasetowijo.myartsonline.com/interview_resume_format.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_bffaaf56bf5b45479dee2904ca5f8a89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ec5862-febe-4180-8edc-dbf2676c1f74/harbor_breeze_fan_with_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe810d1-6b97-4063-8602-d8dc32b7b4fa/poulan_14_woodshark_chainsaw_parts.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_3eecfabc22e840df93f7235d82bc323a.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_f65db6c302214b65858e8b683ca753c4.pdf?index=trueIn PDF document text
    • http://fataragoreb.myartsonline.com/indian_sword_fighting_classes_near_me.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_478523d5708842048b4ca68743c7701a.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_e36ffa513db642b19bc629685607052b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e997fad-4f43-45d9-9baf-f91b498dccda/what_does_the_latin_in_handmaids_tale_mean.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_80979bb0b1f5428ab31b3a8a95a31fd6.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 5448 bytes
SHA-256: 855ad9bc6d4ad96aa4a46fd4039e634ca20c07a6f3de721e90b34542a3f5b044
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10216 bytes
SHA-256: 10f12fed26d1af63822922353e11607f9ab7ce11a11a8a63ca49ace7c21453c7
font_02_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd