Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e0389df3881c7c…

MALICIOUS

PDF

88.0 KB Created: 2021-06-13 19:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d9d6d3eebe47c70a3558ac0c9f8c622e SHA-1: 7a3e23e504125d8d44b998583bf7b95dbc7611ee SHA-256: 04e0389df3881c7c0c3da9a6b95ac1c647374a20fc6b039942931dfe384212ab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of a 'utm_term' parameter in one URL points towards a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ketchas.ru/pbw?utm_term=army+extreme+car+driving+3d+mod+apk PDF link annotation
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/janugupuf-runivusiwu-makediwurume.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/wekizuve.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/nujotafizoten.pdfIn PDF document text
    • https://ledugatikafaf.weebly.com/uploads/1/3/4/6/134693541/3073806.pdfIn PDF document text
    • https://xevusego.weebly.com/uploads/1/3/5/2/135295893/58c7d05b4c.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/luxegojajamekon.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/8320730.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/nigoni.pdfIn PDF document text
    • https://lavulujataj.weebly.com/uploads/1/3/4/5/134576306/5b68fe48.pdfIn PDF document text
    • https://mugapasuxow.weebly.com/uploads/1/3/1/4/131437627/2e20a6cae1a8553.pdfIn PDF document text
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/9631013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144575349/the_adventure_of_the_speckled_band_summary.pdfIn PDF document text
    • http://kosumepifise.pbworks.com/f/xozavisisenoxub.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/lomalidewavaxedufiroker.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/145256352/27787533094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425a4deb-c70b-49ce-a208-7e26694b82a0/palituzumoleses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7922e1f-5ab5-428e-acd6-f2baf7952cb6/niveles_de_prevencion_de_leavell_y_clark_vih.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf4f1a1-aadc-431d-9ab6-290618e8bd27/wegoxotuzifapapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6f7299-9eab-4e57-90ce-bbe827da1e3e/vaxurofebaw.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/f/93991930177.pdfIn PDF document text
    • http://jevibufile.pbworks.com/w/file/fetch/144658446/19287432515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99af8379-04c0-4cd4-9361-813857cef6d9/pedafunodaza.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 5632 bytes
SHA-256: 84c3cbcf4afddb4c9bd063025c898aa0b9b383425d097eef3521ae2140e5646f
font_02_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 2408 bytes
SHA-256: d11767a2c6819e2b783f90487c0b0c52cdf56fb7f3e72b1d13162e1ac6962b1a
font_03_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 10920 bytes
SHA-256: 0014137e76fe9fb8a3b752a82ee32646a55ee9ee27f9205011688e5b2d0093a6
font_04_sfnt_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 19096 bytes
SHA-256: 44aab688c7edb72e911e56d0f056971aae57000658351d16a6026365b485a70f