Malicious PDF — malware analysis report

Static analysis result for SHA-256 1050fff1a47d1e61…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 15:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9afbe02f30b5e93da5a59b3e1f7814d6 SHA-1: 315c82c0601bf58ff2dd27aedab9c924f28ef209 SHA-256: 1050fff1a47d1e610b724d4a9f26b96e8343a26a2c780a54a70f8eba628476cf
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=reset+tp+link+tl-wr841n PDF link annotation
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/finekezogimo-rusilubu-vijelupepo-vezite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_6025c3bd845fb.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/CHdJVja/cheetah_running_full_speed_vs_car.pdfIn PDF document text
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/kusipenumozenug_zulosizapaxev_datumu_saxipibo.pdfIn PDF document text
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/tajupipij.pdfIn PDF document text
    • https://cdn.sqhk.co/luketopaja/g3CrxNZ/acta_de_constitucion_de_un_proyecto_formato.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/fwNggjc/30157091826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_6042119fa35df.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/602083.pdfIn PDF document text
    • http://okstore.info/dipunikijkgyrr.pdfIn PDF document text
    • https://lanedipeluta.weebly.com/uploads/1/3/4/6/134666686/9955592.pdfIn PDF document text
    • https://gulegeletemewux.weebly.com/uploads/1/3/0/7/130738758/5105833.pdfIn PDF document text
    • https://miwuzuxatidako.weebly.com/uploads/1/3/0/7/130775980/4579399.pdfIn PDF document text
    • http://marketeuro.pro/spiderwick_chronicles_book_31nrb0.pdfIn PDF document text
    • http://alania365.ru/data_analysis_procedure_in_qualitative_researchzmdrp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_1977cd7e3d514297962d91e30069706c.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_65f6eae729004ad99dc10237a66064ee.pdf?index=trueIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_ecdeb92319ee4ed6b47ee2ba9fa2ea49.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_c5569c4274124fc9b664b043fca9bd98.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_7e501fcdba21446d85bebb2c8d78bb2e.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 5132 bytes
SHA-256: f3413ad59d693968d9138ef8cbc7b558853ed670d53b090b43e1e0373e43aede
font_02_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 10612 bytes
SHA-256: b591dad5edc3335638a5b0985e52adb7fd73a162d7e93b952534fe1ac36d11da