Malicious PDF — malware analysis report

Static analysis result for SHA-256 05baeb050c9ec5d5…

MALICIOUS

PDF

83.6 KB Created: 2021-03-20 19:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 13a23a613356151414b7a2ceb08127a9 SHA-1: 1164663303f9d2f0a3ac088b289bf8a9f0da15dc SHA-256: 05baeb050c9ec5d5eebc758e31c45c9f0fa1d67e84bb6549070ec485d4511d3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9990

Heuristics 5

  • 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://leonvi.ru/strik?utm_term=cuales+son+los+3+tipos+de+derechos+humanos PDF link annotation
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/4865737.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/27749838319.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/medanu.pdfIn PDF document text
    • https://taxesewisozigif.weebly.com/uploads/1/3/5/3/135394589/6b8e25.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/jijabil.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/38934742249.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/lijerotil-vexutusofaruv.pdfIn PDF document text
    • https://takogazaka.weebly.com/uploads/1/3/4/0/134017011/giramoganefov-vovagug.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/62449745715.pdfIn PDF document text
    • https://dopubitiru.weebly.com/uploads/1/3/0/7/130776304/mefemakebos.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/raseminolojepizejaxa.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/union_transformation_in_informatica_tutorial_gateway.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/ce33e88d-f5e1-4c8d-b65c-cb37091bfc52/bexiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea351a2e-95b9-4a1f-8b2c-b9b733a69b31/principles_of_engineering_thermodynamics_8th_edition_download.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_7f3e56ed1c874c5bb95655515fb2a7a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae1a72e-a487-495f-abbe-649c752c8715/sufovawikexezuw.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_92678b541d4a4d88ab14e2663e834409.pdf?index=trueIn PDF document text
    • http://peforiroli.epizy.com/best_german_learning_books.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_98d5851692344eed8ccb2c90c3a6a395.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95c628e-d169-4c81-bb55-9509b6fa52ac/rca_universal_remote_codes_for_emerson_dvd_vcr_combo.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_c2eba935b22d41a18d5b69a9f918f78e.pdf?index=trueIn PDF document text
    • http://rodedewezijore.atwebpages.com/kigiramifuwivevukedu.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_98738bc435094db6944a94f4f68b7c1b.pdf?index=trueIn PDF document text
    • http://kasedabinat.rf.gd/72870443995.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_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 5380 bytes
SHA-256: 960c831bc7fcfa0167002e26d697626f6dc596d3abd36ba8ab2473108f02df0e
font_01_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 1584 bytes
SHA-256: dec000e0970f68e4fe78892990680a75b144e49666fc4591249ca8dac4e543e1
font_02_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 12148 bytes
SHA-256: 3d3ce6075688769c7028a33476a760a25261feb09de38e5060d82c759888c8c9