Malicious PDF — malware analysis report

Static analysis result for SHA-256 374575252aa741a2…

MALICIOUS

PDF

81.8 KB Created: 2021-03-20 14:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1847cd28ee2a720e1753b82eda0cf16e SHA-1: 5e52183a60f0e35044286df472cc8aadb32573da SHA-256: 374575252aa741a28278d3f92008a9c307bc1af5c826a86abed1597135ced64b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation. One prominent URL, 'https://seumenha.ru/award?keyword=dha+bahawalpur+balloting+results+pdf', suggests a lure for users searching for specific information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/award?keyword=dha+bahawalpur+balloting+results+pdf PDF link annotation
    • https://wetugaremuzen.weebly.com/uploads/1/3/5/2/135298520/buzizonado.pdfIn PDF document text
    • https://tivenudonokokom.weebly.com/uploads/1/3/0/9/130969369/211972eaa9ee5d.pdfIn PDF document text
    • https://cdn.sqhk.co/boremagu/bxfogjT/assassin_s_creed_1_pc_highly_compressed.pdfIn PDF document text
    • https://cdn.sqhk.co/fegozanodedu/1jeApji/google_sheets_if_and_then.pdfIn PDF document text
    • http://jusuzabajalaz.22web.org/smart_br_hr_bracelet_user_manual_m4.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/rkjaibT/jefepuker.pdfIn PDF document text
    • http://dunijekunabov.22web.org/41576321012.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/iijjaha/sizegubewaxavidel.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/k9jbgia/86352268093.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/bmjiibH/office_space_bosses_quote.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/jduphhi/permgen_space_tomcat.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/iaeUp5i/4395235452.pdfIn PDF document text
    • https://cdn.sqhk.co/sebetite/FqjgcPy/dodgers_nationals_score_last_night.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/afabb7dc-67f1-489f-a803-8611ad5c41ed/vorumevobodediri.pdfIn PDF document text
    • http://rupiroliwon.epizy.com/advanced_computer_architecture_notes_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330e1858-dc76-4cfd-9d5a-077112681eda/16257633185.pdfIn PDF document text
    • http://keguwaburafokul.epizy.com/worksheets_main_idea_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c59c128-6a9a-45fd-8f0b-4ea64c7d96a2/acer_aspire_one_zg5_hard_drive.pdfIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_c19ff6e9a9344c1cb0b2049f62120b97.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_6a9ac2648afe4da585caff4028a50251.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_c87a5a38f1734ddba1f8afe61388c4b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfda4c01-38c4-4077-b83c-114a76df3675/delonghi_magnifica_s_cappuccino_coffee_machine.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_85421e043e714f69a7501f86f5ade67c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f701de31-0da2-4e38-a88b-e6102ec273df/85144074812.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 5532 bytes
SHA-256: b681dd387a5ec0236a5dd685193075af800d4fdf584d2ce798c719c680d6c561
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 11440 bytes
SHA-256: d6d2155c9b72c4ab70c64fdfce54160684e39eba1e5ea2ab70e06f787077bb73
font_02_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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