Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da19fd8a013c165…

MALICIOUS

PDF

82.1 KB Created: 2021-04-03 03:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 919c5910e7b2cf75c50c52d47f3edad7 SHA-1: 551f8e2b9eb65f359f20a1a74a4469326cda71ee SHA-256: 1da19fd8a013c165d0444d59363984e963971aa00157447330b992178546a790
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=book+love+quotes+for+her+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480598/normal_603d90b0daddc.pdfIn PDF document text
    • http://sreda.city/bugumofavavarurilarubouuo9g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_601837c017071.pdfIn PDF document text
    • http://afracheat6.xyz/59019205586z91sn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_60116ff219e80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451044/normal_5fc907bf53183.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/toro_timecutter_z4200_front_tire_size5pu5y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_60348b4ade348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485308/normal_600e53aa8feaa.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/essentials_of_oceanography_downlbxb83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5ffbaf8f7ed9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_603cb55603666.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/eb848e34-f34b-4024-a4dc-d2a66b99744e/22456836544.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/how_to_assemble_simmons_slumbertime_crib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89d212a-ab55-4073-9ca2-9b03b3b8f310/singer_stylist_543_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/xusarebawotomana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1c3f6c-ec54-4825-9c31-943a81d82129/begolowefafunu.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_ca20914b6bb04eb19285cce42c556e12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eca41b2-99c0-4af4-ac78-2002eba1c654/how_much_is_color_copies_at_fedex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe680e4-75c8-428a-abef-297084ae8ea6/28625833166.pdfIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_fdb8c90c6a424679945dfa94d18cbe60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widiku/rinonuforarekakise.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/sap_basis_course_content.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/45107920295.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_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 5116 bytes
SHA-256: 7a45c64f8d94ded6de1b87f422f8b42a57dd6a28dfd9e9ef683b56b2e37b75a7
font_01_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 11768 bytes
SHA-256: dc73e852e6e8930885b1bb4111a0ce5f240436edad4e938d621e24c7b9eefee8