Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1e2ac58aac88c8…

MALICIOUS

PDF

81.2 KB Created: 2021-03-24 17:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3215789c7d2d572c19494d14ff9936b SHA-1: 14776868c5f7944d29524d33aa13f6ad17efe804 SHA-256: dd1e2ac58aac88c821c1eb26620303ba29f9dd61c409a0fbc03b4241976c4ecd
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 0.9997

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=which+16+personalities+are+compatible PDF link annotation
    • https://togelugifipa.weebly.com/uploads/1/3/4/6/134648123/nulikajukopisef-temajupa-mozuxifigo.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/jaxulikik.pdfIn PDF document text
    • http://devicesprotectionforusers.site/98324176468khpt8.pdfIn PDF document text
    • http://zelopaqq.xyz/anatomy_and_physiology_an_integrative_approach_downloadz31mb.pdfIn PDF document text
    • http://wejnpowk.space/walmart_platform_bed_frame_queen4t0n4.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/56c7245cec0012.pdfIn PDF document text
    • https://memudodonimik.weebly.com/uploads/1/3/1/4/131406547/b482f56a708bd1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b0d3df44-59f1-4c0c-91e2-285944257b76/psychology_and_christianity_five_views_critique.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_600e519c23194c369f8e8cdbbe739420.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_0044ed43c87743b7813a40113ae5f250.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cc0a7d-ac93-4ada-9eef-936740a29813/maytag_centennial_dryer_not_hot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730ae60d-46a1-40c9-82b3-b8a55c5859bc/keruxubuwemazilibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ddefb9-dd20-4545-93ad-095e6a9a4a44/kupofol.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_5927301e10aa4074b5d69e59f72b063c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dd3c09-c721-4ea2-a92e-0e6b73996ea2/epson_workforce_840_manual.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_5f2a51ef623c4bc5a51b8e3007b80d55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd6cec2-1654-4826-95df-bc9a647e265e/pinubifekalinimamagenik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4883004-9015-460a-9aa2-c88f044b7257/how_to_fix_clothes_steamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a2add9-7806-4a3d-ac6e-e6bb211b09a1/the_norton_field_guide_to_writing_with_readings_and_handbook_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb3aba9-bc9c-4496-bec0-a5a06714c428/mr_coffee_coffee_grinder_parts.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 5320 bytes
SHA-256: 8b84600900f1fd2af8957e35dc2ec3ddb0bc8922466d94cf391a7acbe8813473
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 10580 bytes
SHA-256: cd11676ea3c0ce7d7b0090dffda50f839914c41c82a3237da743a2ed9b3f2bcb
font_02_sfnt_off000128b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c