PDF malware analysis — malicious · f8b881dea31ae57b

MALICIOUS

PDF

94.2 KB Created: 2021-05-20 09:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: e41272b2ce5a6ada32a3d2f9508f701c SHA-1: 03bf499b8b09f12e75515f636e4594a6e58d31c6 SHA-256: f8b881dea31ae57b5826b6fcff2d0fddbbc9d8f4b446ff901ecc3f46e21c7576

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to other malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF's structure suggest it's used to facilitate phishing or malware delivery by redirecting users to compromised websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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 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.
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://jacksth.ru/strik?utm_term=academic+journal+guide+2020+pdf PDF link annotation
- https://vifapuxup.weebly.com/uploads/1/3/4/0/134018045/pirasopagefafada.pdfIn PDF document text
- https://poxixarusel.weebly.com/uploads/1/3/4/1/134131789/nefegowurimuvojodor.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4473340/normal_5fdb52fa25380.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380230/normal_604ef15820923.pdfIn PDF document text
- https://xemavuvewo.weebly.com/uploads/1/3/5/3/135394060/sejavox.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/c014b7a0-8bae-4753-968d-5255173b7456/stephen_king_11_22_63_novel.pdfIn PDF document text
- https://s3.amazonaws.com/pusori/phool_ye_angaar_song.pdfIn PDF document text
- https://s3.amazonaws.com/vizegemawokaxe/stanley_450_amp_jump_start_system_with_compressor.pdfIn PDF document text
- https://s3.amazonaws.com/divelikubapiwaj/banco_cetelem_telefono_informacion.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c411e29a-7a94-4378-8994-cad115b0fb4a/54666985506.pdfIn PDF document text
- https://s3.amazonaws.com/bufexa/preliminary_report.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/eb6fdb41-39c9-4331-97d2-1808a6b661f4/39531910170.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/77daaba7-5c9e-42e9-b39e-fd62f0de5b6f/what_is_philosophy_of_social_science.pdfIn PDF document text
- https://s3.amazonaws.com/nitidadufetenu/41381021629.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e26d717f-52ff-42b8-925a-d0cabeede982/47021554879.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/def1ea2b-bfe4-41dc-aced-fafc4447b8fc/how_do_i_update_my_samsung_a30_software.pdfIn PDF document text
- https://s3.amazonaws.com/makumapikeze/nefudofuwaruxax.pdfIn PDF document text
- https://s3.amazonaws.com/xopugup/evenflo_manual_breast_pump_bottles.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e79ac045-7c35-4696-ba61-a537fddaed1e/bushnell_16mp_hd_essential_e3_trail_camera_for_sale.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1c449a8b-dd0c-4566-8f05-2197c842a903/hp_laserjet_4_plus_driver_windows_10_64_bit_download.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010e99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E99	5440 bytes
SHA-256: `895a6bff296e24312ae7cce9bcb1858e71c7c531fcafa4d6595fe2bb6822f4d3`
`font_01_sfnt_off000120f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120F0	11620 bytes
SHA-256: `4053cca284a0576b3ee9ac3dcf1a77b557db1fe93e5a26d39535b282544fb57d`
`font_02_sfnt_off0001488c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1488C	16060 bytes
SHA-256: `4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d`
`font_03_sfnt_off00015d24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15D24	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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