Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2de7f84c4a35ede…

MALICIOUS

PDF

76.1 KB Created: 2021-03-21 21:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 677dda78f50ea9e591376c76edb296ca SHA-1: 36e841f89bf2a994d46276649e1d41d688a8e578 SHA-256: f2de7f84c4a35edef6a111be11b7be936b296b3185fa09be5a0753b8d70b00fa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO poisoning and directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL `https://xezojetit.ru/wix?keyword=merriam+webster+dictionary+apk+mod` suggests a lure related to downloading a dictionary application, likely to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xezojetit.ru/wix?keyword=merriam+webster+dictionary+apk+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411682/normal_60294a7e14ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_600ef93b0f702.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/michigan_common_core_standards_1st_grade_math.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/f9f050d3-3c02-4414-bace-c7d5ae53f9aa/zavibixuponuduwifajoz.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/jitinimeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37eec2d-8de9-4520-9d90-f0e14dd469ec/organos_que_conforman_el_sistema_endocrino_y_su_funcion.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/bachelorette_invitation_templates_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e27fd1f-deef-4206-b0cc-750f182b9e70/functional_independence_measure.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/aprendizajes_clave_secundaria_socioemocional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4214d377-7a22-4540-b84e-df0b5ec5a39c/vevagogidawamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6bfeb0-206c-4147-b522-33d04379b687/how_to_control_sonos_soundbar_with_samsung_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/34067737471.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_1c8fe03df04a4e46bf7c8ea6608cb92d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a342467-7801-4cfb-a006-5c16f0e0a309/how_long_to_cook_whole_chicken_in_air_fryer_rotisserie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a81c20-c98e-4319-bcae-76db1d46c65f/62629465015.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_1a685efa140a464d91f6a79cb6cae83d.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_fe4f248e4c784f279d5f642ccfb20382.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kimone/robepamakureziwo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 5588 bytes
SHA-256: 173ca0ad75df0c58fd500f48eabffa7d4d50b5e5d8560e58bb2fbd2b8a669d9b
font_01_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 10328 bytes
SHA-256: a9705216110a371310f06c022f942b789b8ffb125d3b71ea2f7abd765d587617